Abstract: A security device and fastener is used in a security system and method. The device has a body portion with a base, an outer surface, a cylindrical cavity and an inner radial flange defining a bolt hole that is coaxial with the cavity. The sidewall of the cavity is sized to have reduced radial clearance between a standard bolt head and a standard wrench socket to prohibit removal of the bolt except with a specially configured socket. The fastener includes this device and a nut and bolt combination. The system includes the fastener and the specialty wrench tool. The security device can be formed as part of a fixture that is adapted to secure a sign to a support, such as a post. The method includes the steps of providing a security device as disclosed, providing a specialty socket and securing a plurality of items together therewith.

Abstract: A socket for transmitting torque from different types of wrenches to a fastener includes an elongated socket body. The body has a fastener engaging end with a plurality of internal fastener engaging surfaces defining an axially facing internal fastener engaging opening. The fastener engaging surfaces are configured to engage with the fastener. The body includes a drive end having an axially facing internal drive opening configured to receive a socket mounting portion from a socket driving type of wrench. The drive end of the socket body also has a series of external flat drive surfaces circumferentially separated by external surfaces having a smaller circumferential width. The flat surfaces are configured to be engaged by inwardly facing drive surfaces of an external driving type wrench. The socket body is tapered axially between the drive end and the fastener engaging end, with the drive end being wider than the fastener engaging end.

Abstract: An improved tamper resistant screw and driver tool. In one embodiment, the present invention provides a tamper resistant screw and screw driver tool. The screw head features a unique tamper resistant design. The screw cannot be turned successfully with standard screw drivers, pliers, vice grips, wrenches or socket type wrenches. It is driven by a specially designed driver tool which, upon application, is centered on the screw head to avoid side-to-side slippage and is driven by angle-to-angle contact. The angle and depth of the drive tool can be changed to maximize the amount of torque delivered to the screw. This design not only discourages an individual from attempting to gain access to a restricted area, it will clearly indicate if the screw head has been tampered with by means of score marks and gouges.

Abstract: There is described and claimed herein a noback bolt design which comprises an elongated shaft having two opposing ends. The first end has an enlarged conical bolt head that extends from this shaft. On the opposite shaft end is a terminus or tip. Between the tip and the conical head, the shaft bears an externally threaded segment on at least a portion of the shaft. The precise length of this segment is determined upon intended applications of my bolt, and the type or exact number of structural components to be assembled. These components include panels, brackets, planar surfaces, chassises, and like structures.

Abstract: An adjustable socket operates to rotatably drive a fastener. The adjustable socket includes a first recess disposed in the socket receptive of the fastener; and an adjustable stopper disposed in a second recess of the adjustable socket for limiting penetration of the fastener into the first recess.

Abstract: An asymmetrical wrench and fastener system comprising radially extending splines having opposing surfaces whose inner ends are inclined by different amounts with respect to a radius intersecting the respective inner ends to alter the torque between the tightening and loosening directions. This configuration makes it either easier or harder to loosen the fastener than it was to tighten it, depending on the amount the opposing surfaces of the splines are inclined.

Abstract: A ratchet wrench structure includes a wrench body, a ratchet wheel, and a socket. The ratchet wheel has a center formed with a combination hole which has an inner periphery formed with a plurality of insertion ribs. Each of the insertion ribs of the ratchet wheel includes two first insertion faces located on the two opposite sides thereof, and a second insertion face located between the two first insertion faces. Thus, the ratchet wrench structure is available for sockets with sector-shaped and arcuate-shaped insertion recesses.

Abstract: A fastener extractor is provided that includes an attachment end having an attachment means for connection to an extraction tool and a receiving end. The receiving end has an interior bore that angles inwardly towards the attachment end. The interior bore has a central axis and includes at least two arcuate grooves that extend along the interior bore towards the attachment end. The arcuate grooves curve radially and inwardly towards the central axis of the interior bore, with adjacent arcuate grooves forming sharp helically shaped ridges. A transition area is positioned between the attachment end and the receiving end and has a plurality of arcuate surfaces. Each of the plurality of surfaces corresponds to each of the arcuate grooves and projects inwardly from the corresponding groove towards the central axis. The interior bore is engageable over a fastener to be extracted.

Abstract: A wrench includes a box end which has a through hole and a polygonal inner periphery is defined in an inner periphery of the through hole and located close to a first side of the box end. A plain inner surface is defined in the inner periphery of the through hole and located close to a second side of the box end. An inner diameter of the plain inner periphery is larger than an inner diameter of the polygonal inner periphery. A spring member is engaged with the through hole of the box end and enclosed by the polygonal inner periphery. A nut can be engaged with the polygonal inner periphery by pressing the spring member and is rotated with the wrench, or is freely rotatably engaged with the plain inner surface while the spring member is not compressed.

Abstract: A device for use in a torque transmitting system including a driver having a specially configured driver end and a fastener having a specially configured recess for receiving the end of the driver, wherein the respective externally configured and internally configured components include a body having an axis in which the body has an outer polygonal cross section defined by a perimeter wall, an inner polygonal central portion positioned within the perimeter wall and having an area less than the area of the outer polygonal cross section; a drive wall which forms a portion of the perimeter wall and extends on a plane from a proximal end outwardly from the polygonal central portion to a distal end; a first outer wall forming another portion of the perimeter wall has a proximal end joining the distal end of the drive wall at an angle which may be less than 90° and a distal end terminating on the perimeter wall.

Abstract: A tool comprising a drive shaft with a longitudinal axis and a socket attached to the drive shaft. The socket includes a cavity having a substantially rectangular opening defined by a pair of parallel side walls of the first side length and a U-shaped wall having two parallel walls adjacent to the opening and a curved portion of the U-shaped wall opposite the opening. In this manner, the cavity is shaped to fit the contour of a typical screw hook such that the screw hook can be anchored to a wall or ceiling with relative ease because the screw hook will not rotate away from the longitudinal axis of the tool.

Abstract: The present invention relates generally to a security screw (1) having threaded shank portion (2) and head portion (3). The head-portion (3) is characterized by having a circular profile with a cylindrical peripheral wall (4) and a smooth crown (5) without any tool engagement slots, recesses or other profile in contrast to a convention screw. The security screw (1) is driven into place by way of a driving tool (9) having shank portion (10) adapted to be rotated by a suitable implement such as a power drive. The driving tool (9) further comprises a cup portion (13) incorporating a cylindrical recess (14) coaxial with the shank (10). The recess (14) is sized and shaped to fit over the head portion (3) of the screw (1).

Abstract: An improved tool for use in association with a deformable nut of a fastener includes a socket having inner surface that forms a cavity on the socket. The inner surface includes one or more engagement surfaces that are tapered inwardly at an angle that approaches a taper of a deformable wall of the deformable nut. In one embodiment the tapering of the engagement surfaces is provided by configuring the engagement surfaces to extend in a tapered fashion generally toward a central axis of the socket. In another embodiment, the tapering is provided by configuring the engagement surfaces to each extend in a spiral fashion about a spiral axis that may, for example, be parallel and spaced-apart from the central axis of the socket.

Abstract: A tool for driving headed fasteners has an opening in the tool. The opening is defined by a wall of the tool. The wall has a plurality of flat planar surfaces. The planar surfaces are connected by a connection at the ends of each planar surface to define the opening. Each connection surface has a convex surface continuous with the planar surface. A concave surface is continuous with the convex surface. The convex and concave surfaces define arcs with the arcs having the same radius.

Abstract: A socket for a wrench has a body with a central hole defined in one end of the body and a connecting device formed on the second end of the body. Multiple protrusions are formed on the inner surface of the central hole. Each protrusion has a peak and multiple teeth formed on one side of the protrusion. With such a socket, the socket can securely hold the head of the fastener with the teeth on the protrusions even when the head has been worn away.

Abstract: An improved tool for use in association with a deformable nut of a fastener includes a socket having inner surface that forms a cavity on the socket. The inner surface includes one or more engagement surfaces that are tapered inwardly at an angle that approaches a taper of a deformable wall of the deformable nut. In one embodiment the tapering of the engagement surfaces is provided by configuring the engagement surfaces to extend in a tapered fashion generally toward a central axis of the socket. In another embodiment, the tapering is provided by configuring the engagement surfaces to each extend in a spiral fashion about a spiral axis that may, for example, be parallel and spaced-apart from the central axis of the socket.

Abstract: A tool is provided in an outer surface with a first identification device and a second identification device disposed on the first identification device. The first identification device is used to associate the tool with the metric or British system in terms of specification. The second identification device is used to print thereon the specification of the tool.

Abstract: A toolkit includes at least one socket made according to the metric system, a first joint for connecting a head of a wrench with the at least one socket made according to the metric system, a first ring made of a first color and mounted on the first joint, at least one socket made according to the British system, a second joint for connecting the head of the wrench with the at least one socket made according to the British system and a second ring made of a second color other than the first color and mounted on the second joint.

Abstract: There is described and claimed herein a noback bolt design which comprises an elongated shaft having two opposing ends. The first end has an enlarged conical bolt head that extends from this shaft. On the opposite shaft end is a terminus or tip. Between the tip and the conical head, the shaft bears an externally threaded segment on at least a portion of the shaft. The precise length of this segment is determined upon intended applications of my bolt, and the type or exact number of structural components to be assembled. These components include panels, brackets, planar surfaces, chassises, and like structures.

Abstract: In a tool for releasing a motor vehicles hex lugnuts(1,2,3), it is known that there are four to six hex lugnuts that hold down the rim of a wheel to the studs of any motor vehicle axle. In this invention a 20 inch bar (3)with an adaptor ⅜″ box (1,6) at one end and a “T” bar (2)with support wheels (4) at the other end form a one piece unit to release hex lugnuts on motor vehicles.

Abstract: A kickoff socket assembly includes a socket and an insert member that fits closely inside the socket. The insert member includes a body portion and a projection. The projection integrally extends from the body portion, and has a distal end disposed a predetermined distance from the open end of the socket, and is narrower in diameter than the body portion of the insert member. In use, a nut is placed over the projection such that the projection extends partially through the nut. The nut is engaged with a threaded shaft and the socket is rotated to drive the nut onto the shaft. Rotation of the nut is stopped by engagement of the distal end of the projection with the shaft when the nut is threaded the predetermined distance on the shaft.

Abstract: A threaded fastener capable of being reduced in size and weight. A pair of side wall surfaces (18) of each of six radially outwardly projecting, torque transmitting portions (16) lie on straight lines passing through the center line (O) in a cross section perpendicular to the center line (O) so as to transmit torque through the side wall surface (18), whereby the direction of a surface orthogonal force N applied to a force-applied point P by a wrenching tool coincides with the direction of an effective wrenching force F. This arrangement reduces an operation force required for rotating the wrenching tool and accordingly the load acting on each of the torque transmitting portions, in comparison with a conventional hexagonal head (100). That is, it is possible to reduce the diameter of the head portion (12) of the threaded fastener (10) and the size and weight of the head portion (12), while avoiding deformation of the side wall surfaces (18) through which the torque is transmitted.

Abstract: A socket structure includes a main body having an outer wall formed with a driving portion and an indication portion. The driving portion has a plurality of successively and longitudinally arranged teeth. The indication portion provides an indication and identification function, thereby facilitating a user identifying features of the socket structure. A method for manufacturing the socket structure includes the steps of: choosing material, forging, coarse grinding, broaching, turning, rolling, hardening, polishing, surface treatment, and forming the product.

Abstract: The present invention 10 discloses a universal lug wrench that can be used by ordinary people to loosen and fasten the lug nuts 12 on automobile tires 14 without undue strain on the users part. This is made possible by a supporting adjustment stand 16 and the longer arm 18 of the wrench 20. The present invention 10 is also easy to disassemble and store and also versatile as the sockets 22, 23 for the lug nuts 12 of different sizes can easily be interchanged. The purpose of the wrench 20 is to exert a torque on a lug nut 12 at the socket 22 end and around the axis by pressing the handle end 21. The improved wrench of the present invention 10 eliminates the unwanted torque generated by a conventional wrench 24. The present invention 10 has an extension 54 for the sockets 22 that are inserted into the adjustable clamp 56 and provides a pivoting point for the wrench 20. Various sockets 22, 23 can be interchangeably used for lug nuts 12 of different sizes.

Abstract: A socket for a wrench has a body with a central hole defined in one end of the body and a connecting device formed on the second end of the body. Multiple first protrusions are formed on the inner surface of the central hole, and each first protrusion has a peak with a first angle. A second protrusion is formed on the inner surface of the central hole between each pair of adjacent first protrusions. Each second protrusion has a peak with a second angle and a recess to make the second angle smaller than the first angle of the peak of the first protrusions. With such a socket, the socket can securely hold the head of the fastener with the peaks on the protrusions even when the head has been worn away.

Abstract: A multifunction tool (10) has a body with an elongated section (15) with tool chuck (18) mounted at the end. The tool chuck has a square exterior (135) and hex shaped interior (139) for both mounting and storing a socket tool (137) and also holding a bit when the socket tool is stored. The body also has a cavity (76, 110, 166) for storing an elongated tool along the elongated section. The bottom of the handle has a blade sharpener (86) or a bottle opener (150) built therein.

Abstract: A ratchet socket includes a socket body having an end formed with a mounting hole. The mounting hole has an inner wall formed with twelve resting protrusions and twelve chambers located between the twelve resting protrusions. Thus, by provision of the twelve resting protrusions and the twelve chambers of the ratchet socket, the ratchet socket can be used to operate a special screw, such as the gear-shaped screw, the ratchet screw, the star-shaped screw or the like, thereby greatly enhancing the versatility of the ratchet socket.

Abstract: A tool for removing threaded members, such as fasteners, damaged by corrosion or mechanical stress. The tool includes a first end and a second end opposite the first end. A generally annular body extends between the first and second ends and includes an inner wall. A drive engaging portion is positioned intermediate the first and second ends and is adapted for cooperating with a drive mechanism. A series of spiral flutes is formed along the inner wall of the annular body so as to provide a corresponding series of spiral crests extending along the inner wall. Proceeding from an end of the tool in a direction toward the drive engaging portion, the flutes and crests taper inward toward a central longitudinal axis extending through the annular body. When the tool is placed onto a fastener, the crests bite into an outer surface of the fastener to engage the fastener, thereby facilitating application of torque to the fastener to facilitate its removal.

Abstract: A security device and fastener is used in a security system and method. The device has a body portion with a base, an outer surface, a cylindrical cavity and an inner radial flange defining a bolt hole that is coaxial with the cavity. The sidewall of the cavity is sized to have reduced radial clearance between a standard bolt head and a standard wrench socket to prohibit removal of the bolt except with a specially configured socket. The fastener includes this device and a nut and bolt combination. The system includes the fastener and the specialty wrench tool. The security device can be formed as part of a fixture that is adapted to secure a sign to a support, such as a post. The method includes the steps of providing a security device as disclosed, providing a specialty socket and securing a plurality of items together therewith.

Abstract: A high torque wrenching system having a wrench with asymmetrical torque transmission capability. The wrench includes a plurality of protuberances and a plurality of recesses around a central axis. The fastener also includes a plurality of protuberances and recesses around the central axis for mating with the wrench. The protuberances and recesses form a saw tooth shape. Each tooth or protuberance is formed by a first wrenching surface for loosening the fastener and a second wrenching surface for tightening the fastener. The wrenching surface carrying the loosening load is at a much smaller angle with respect to a radial vector extending from the wrench's central axis than the wrenching surface carrying the tightening load. The result is that the loosening torque vector will have a much greater moment arm.

Abstract: A multi-piece socket system having a large internal cavity to allow a protrusion of a long rod or other workpiece to extend into the socket. The socket section has at least two pieces: a drive adaptor and a socket. Optionally, one or more extension collars may also be used. When assembled, the socket, extension collar(s) if used, and drive adaptor form a long tubular body into which a rod or other central member may enter while the nut is being driven onto the rod. The drive adaptor, extension collars, and sockets preferably attach together using a plurality of interlocking teeth on the ends of each member. For further stability, a spring biased pin extends from the wall of one member and through a hole in the wall of the mating member. Additional attachments, such as a threaded rod and drill chuck, may also be used.

Abstract: A tool for demounting a first and a second bead of a tire mounted on a rim, the tool comprising a handle having a first end for disengaging a first tire bead from a rim and a second opposite end for disengaging a second tire bead from the rim. The first handle end includes a heel extending radially outward from the handle; an elongate arm portion extending radially outward from the heel and forming a forward opening crook; a raised arm portion disposed adjacent the crook; and a tip extending radially outward from the body portion. The opposite second end of the tool handle is configured to disengage a second bead of the tire from the rim and includes a heel extending radially outward from the handle; an elongate lever arm portion extending radially outward from the heel and defining an open crook adjacent the heel; and an elongate raised arm portion adjacent the crook extending outward to a tip portion.

Abstract: A wrench for engaging the retaining nut on the air valve stem associated with the inside wheel of a vehicular dual wheel set, comprising, an elongated hollow socket adapted to receive the air valve housing stem, said socket having a closed proximal end and an open distal end and having side walls with inside and outside surfaces, where the inside surfaces of the side walls define the interior shape of at least a portion of the hollow socket as an equilateral polygon, an elongated rigid shaft coaxially attached to the proximal end of the socket and a handle integrally attached to the shaft for rotating the socket.

Abstract: A high torque wrenching system is provided having a wrench with asymmetrical torque transmission capability. The wrench includes a plurality of protuberances and a plurality of recesses around a central axis. The fastener also includes a plurality of protuberances and recesses around the central axis for mating with the wrench. The protuberances and recesses form a saw tooth shape. Each tooth or protuberance is formed by a first wrenching surface for loosening the fastener and a second wrenching surface for tightening the fastener. The wrenching surface carrying the loosening load will be at a much smaller angle, with respect to a radial vector extending from the wrench's central axis, than the wrenching surface carrying the tightening load. The result is that the loosening torque vector will have a much greater moment arm.

Abstract: Disclosed is an asymmetrical fastening system comprising (1) a fastener having asymmetrical loosening surfaces and tightening surfaces formed in a single fastening periphery, and (2) a wrench comprising asymmetrical loosening surfaces and tightening surfaces formed in a single fastening periphery, that engage, respectively, the loosening surfaces and tightening surfaces of the fastener. When the wrench engages the fastener and force is applied to the wrench the torque to failure of the system in the loosening direction is greater than the torque to failure in the tightening direction.

Abstract: An asymmetrical wrench and fastener system comprising radially extending splines having opposing surfaces whose inner ends are inclined by different amounts with respect to a radius intersecting the respective inner ends to alter the torque between the tightening and loosening directions. This configuration makes it either easier or harder to loosen the fastener than it was to tighten it, depending on the amount the opposing surfaces of the splines are inclined.

Abstract: A dolly for transporting material containers including a base having a pair of wheels attached thereto. A handle is removably attached to the base and has a seal and plug removal wrench fixedly attached near one end thereof. A second plug removal wrench is fixedly attached near the opposite end of the handle. A tilting lever is fixedly secured to the handle, whereby a portion of the material container is raised with the tilting lever, and the base is positioned underneath the material container.

Abstract: At least one of two components (1, 3) of a coupling includes a profile with four splines (5) having more or less radial edges (11). Four straight-line segments (6) on the inside of the profile are joined with the splines. The four straight-line segments (6) are designed to circumscribe a standardized square drive (14). This profile can be used for driving sockets and accessories for screwing and unscrewing.

Abstract: A kickoff socket assembly includes a socket and an insert member that fits closely inside the socket. The insert member includes a body portion and a projection. The projection integrally extends from the body portion, and has a distal end disposed a predetermined distance from the open end of the socket, and is narrower in diameter than the body portion of the insert member. In use, a nut is placed over the projection such that the projection extends partially through the nut. The nut is engaged with a threaded shaft and the socket is rotated to drive the nut onto the shaft. Rotation of the nut is stopped by engagement of the distal end of the projection with the shaft when the nut is threaded the predetermined distance on the shaft.

Abstract: An anti-theft device is used with an attachment device used to attach a hubcap to a wheel of a vehicle or a rim to an axle of a vehicle. Such an attachment device may be a bolt or a nut. The anti-theft device has a receiving portion and a key portion. The receiving portion of the anti-theft device receives a head of the attachment device. The key portion has a key arrangement provided on thereon.

Abstract: A tool bit holding device comprises an inner tube, an outer tube, and a clip. The inner tube includes an end and a compartment proximate the end. The inner tube includes an annular groove defined in an outer periphery thereof. A bottom wall defining the annular groove includes at least one slot to thereby communicate the annular groove with the compartment. The outer tube is mounted around the inner tube and slidable along a longitudinal direction of the inner tube. The clip is mounted in the annular groove of the inner tube, The clip includes at least one rectilinear section that is received in the slot and thus partially received in the compartment.

Abstract: The eccentric drive socket is a one piece socket member with a drive lever having a square hole placed off center to the socket member body. The socket member body has a though hole allowing the fastener to pass through. The relationship between the socket member body and the drive lever allow this tool to fit down inside and to be rotated in obstructed or confined areas.

Abstract: A wrench socket for use with a conventional ratchet wrench system to attach or remove a nut or bolt on a surface area. Such wrench socket comprising an elongated hollow cylinder having a first end portion, a recessed end portion having a shoulder, a nut or bolt engaging end in communication with the recessed end portion, a hexagonally shaped socket opening sized to receive said nut or bolt, and disposed midway in the nut or bolt engaging end, and an outer protective sleeve pressed on the recessed end portion, so that when attaching or removing the nut or bolt with the socket wrench system, should the wrench socket slip off the nut or bolt, the outer protective sleeve surrounding the socket opening will contact the surface area.

Abstract: A device includes a body having a plurality of alternating drive regions and corner regions arranged about a central axis for cooperation to define a socket recess having an open outer end and an inner end. Each drive region has a drive surface disposed thereon and confined thereto. At least one drive surface slopes toward the central axis in a first direction generally parallel to the central axis and in a second direction generally traverse to the central axis. The device may be a rotatably driveable device for driving fasteners and the like, wherein the axis is the axis of rotation. The device can be used for retaining and driving a drive member. In one form, a drive member, comprising alternating flats and corners is inserted into the device. The flats of the drive member frictionally engage with at least two of the drive regions, thereby releaseably retaining the drive member in the body. The drive member can be rotated by rotating the body in one of the clockwise and counter-clockwise directions.

Abstract: A car wheel anti-theft device having a lug nut and a sleeve installed onto the bolt of the car wheel and an individual wrench to install and remove the lug nut from the bolt. The lug nut and the sleeve each include an engaging flange. When the lug nut is secured within the sleeve, the engaging flange of the sleeve engages the engaging flange of the lug nut, thereby preventing the bolt from being removed and the wheel from being moved. The lug nut has a front surface having a key projection of a particular shape. The individual wrench includes a cylindrical cavity having a bottom surface. The bottom surface has a key opening extending from the bottom surface towards the depth of the individual wrench. The key opening preferably has a shape complementing the particular shape of the key projection of the lug nut.

Abstract: A socket structure includes a main body having an outer wall formed with a driving portion and an indication portion. The driving portion has a plurality of successively and longitudinally arranged teeth. The indication portion provides an indication and identification function, thereby facilitating a user identifying features of the socket structure. A method for manufacturing the socket structure includes the steps of: choosing material, forging, coarse grinding, broaching, turning, rolling, hardening, polishing, surface treatment, and forming the product.

Abstract: A wrench socket for use with a conventional ratchet wrench system to attach or remove a nut or bolt on a surface area. Such wrench socket comprising an elongated hollow cylinder having a first end portion, a recessed end portion having a shoulder, a nut or bolt engaging end in communication with the recessed end portion, a hexagonally shaped socket opening sized to receive said nut or bolt, and disposed midway in the nut or bolt engaging end, and an outer protective sleeve pressed on the recessed end portion, so that when attaching or removing the nut or bolt with the socket wrench system, should the wrench socket slip off the nut or bolt, the outer protective sleeve surrounding the socket opening will contact the surface area.

Abstract: A fastener extractor is provided that includes an attachment end having an attachment means for connection to an extraction tool and a receiving end. The receiving end has an interior bore that angles inwardly towards the attachment end. The interior bore has a central axis and includes at least two arcuate grooves that extend along the interior bore towards the attachment end. The arcuate grooves curve radially and inwardly towards the central axis of the interior bore, with adjacent arcuate grooves forming sharp helically shaped ridges. A transition area is positioned between the attachment end and the receiving end and has a plurality of arcuate surfaces. Each of the plurality of surfaces corresponds to each of the arcuate grooves and projects inwardly from the corresponding groove towards the central axis. The interior bore is engageable over a fastener to be extracted.

Abstract: A device for use in a torque transmitting system including a driver having a specially configured driver end and a fastener having a specially configured recess for receiving the end of the driver, wherein the respective externally configured and internally configured components include a body having an axis in which the body has an outer polygonal cross section defined by a perimeter wall, an inner polygonal central portion positioned within the perimeter wall and having an area less than the area of the outer polygonal cross section; a drive wall which forms a portion of the perimeter wall and extends on a plane from a proximal end outwardly from the polygonal central portion to a distal end; a first outer wall forming another portion of the perimeter wall has a proximal end joining the distal end of the drive wall at an angle which may be less than 90° and a distal end terminating on the perimeter wall.

Abstract: A socket includes a driving portion having an engaging hole formed by a peripheral wall which has a uniform thickness formed through the peripheral portion for avoiding the stress concentration problems occurred in the driving portion of the socket. The driving portion includes an inner peripheral surface and an outer peripheral surface parallel to each other for forming the uniform thickness of the peripheral wall of the socket. The inner peripheral surface and the outer peripheral surface each includes six curved surfaces and six rounded corners.