Abstract: The present invention is related to an open-end wrench including a first jaw and a second jaw and a throat section connected between rear ends of the two jaws. A toothed section is disposed on the inner side of the first jaw. The toothed section has multiple sharp teeth and a wide tooth positioned behind the sharp teeth. The wide tooth has a largest width among all the teeth. The bottommost point of the throat section is spaced from a front end of the first jaw by a first length. The bottommost point of the throat section is spaced from the tooth crest of the wide tooth by a second length, which ranges from ? to ½ the first length. The toothed section has a length, which is about ? the first length. The width of the wide tooth is 0.325 to 0.375 the length of the toothed section.

Abstract: A tool for assembling and disassembling the front and the rear wheel axle of a motorcycle includes a nut holding base having one side formed with a ratchet recessed groove provided therein with a projecting member having a hexagonal recessed groove formed in the interior. The nut holding base has another side provided with an extension projecting post having an interior bored with a square hole communicating with the hexagonal recessed groove. A connecting holder to be assembled on the nut holding base has one side formed with a hexagonal projecting connector matching with the hexagonal recessed groove of the nut holding base and having an interior disposed with a square insert hole. The connecting holder has another side formed with a hexagonal recessed groove provided with a projecting member bored in therein with an insert hole that communicates with the square insert hole.

Abstract: The present invention is related to an open-end wrench including a first jaw and a second jaw and a throat section connected between rear ends of the two jaws. A toothed section is disposed on the inner side of the first jaw. The toothed section has multiple sharp teeth and a wide tooth positioned behind the sharp teeth. The wide tooth has a largest width among all the teeth. The bottommost point of the throat section is spaced from a front end of the first jaw by a first length. The bottommost point of the throat section is spaced from the tooth crest of the wide tooth by a second length, which ranges from ? to ½ the first length. The toothed section has a length, which is about ? the first length. The width of the wide tooth is 0.325 to 0.375 the length of the toothed section.

Abstract: This tool substantially extends in a general plane (XY) and comprises: —at least one working head (12, 13) intended to cooperate with the fastener; —a handle (14) which is integral with the or each working head; the handle extending along a longitudinal axis (X-X) and comprising a linear portion (15) and at least one connection portion (16, 17) which connects the or each working head to the linear portion, the linear portion of the handle having a section transverse to the longitudinal axis (X-X) which comprises a relatively large transverse dimension substantially parallel with the general plane of the tool (XY) perpendicular to the longitudinal axis (X-X), and a relatively small dimension perpendicular to the general plane of the tool (XY). The large dimension and the small dimension of the transverse section are changing along the longitudinal axis. Use in flat wrenches, combination wrenches and ring wrenches.

Abstract: An electric tightening head for tightening a lock nut of a single through shaft, comprising a supporting plate (1), sliding blocks (2), tightening jaws (3), springs (4), wedged pad irons (5), wedged pad iron connecting arms (6), a pulling rod (7), an initial position detecting bolt (8) and stop bolts (9), wherein the supporting plate (1) is connected with the sliding blocks (2), the tightening jaws (3) and the pulling rod (7); the springs (4) are connected with the stop bolts (9) mounted on the tightening jaws (3); the tightening jaws (3) are connected with the wedged pad irons (5); the wedged pad irons (5) are connected with the wedged pad iron connecting arms (6); and an upper end of the pulling rod (7) is connected with the initial position detecting bolt (8). The beneficial effects of the electric tightening head include simple and convenient operation and high tightening precision, and it meets the process requirements, improves the production efficiency and reduces the labor cost.

Abstract: A lamp socket assembly tool includes an engaging end configured to engage a lamp socket inserted in an opening of a lamp housing, which may be a vehicle lamp housing. The tool includes a driving end operatively connected to the engaging end and configured to receive and transmit an axial and rotating force to the engaging end to assemble or disassembly a socket engaged by the tool relative to the housing. The tool includes a passage for receiving a connector portion of the socket such that the tool is not in contact with a connector interface. The passage may define an aperture through which a connector wire attached to the socket may exit or move freely during rotation of the socket by the tool. The engaging interface may substantially conform to a socket interface defined by a standardized filament lamp, such as an ECE H9 or H11 socket.

Abstract: An open end wrench is provided with a handle; and spaced first and second jaws secured to and projecting from the handle, the first jaw including a first engagement surface and a second engagement surface together arranged in an angled pair, and the second jaw including a fourth engagement surface. The second engagement surface is closer to a bottom of the first jaw than the first engagement surface. The second engagement surface extends at an angle between 2-degree and 7-degree with respect to a virtual center line passing an opening between the spaced first and second jaws. The fourth engagement surface extends at an angle between 2-degree and 5-degree with respect to the virtual center line. The second engagement surface is not parallel to the fourth engagement surface.

Abstract: An apparatus for turning a railway handbrake wheel having an axis of rotation and a circumferential wheel rim located along a wheel plane perpendicular to said axis spaced apart from said axis by spokes may comprise an inner block engagable upon an inner surface of the wheel rim, an outer block engagable upon an outer surface of the wheel rim, a connector extending between and fixedly connected to the inner and outer blocks and a handle extending from the outer block.

Abstract: An improved open end wrench having wrench heads at both ends of a shank whereon both wrench heads have arcuate surfaces and backup jaws coplanar with a common torqueing jaw whereby the torqueing jaw is a machined surface of the wrench shank that extends into the wrench heads and is terminated at reliefs at a depth less than half the thickness of the shank, at the intersection of the arcuate surfaces and said torqueing jaw, therein, when excessive torque is applied the relief tends to close whereby the backup jaw and torqueing jaw become nonplanar to each other, therefore wedging the polygonal fastener being worked.

Abstract: The present invention discloses an open wrench including handle and driving head connected thereto. The driving head has clamping opening and opening. The driving head has a stepped outer flat surface and an inner flat surface which is arranged in U shape and located along the clamping opening. The outer flat surface is higher than the handle. The inner flat surface is higher than the outer flat surface. The outer flat surface and inner flat surface have an included angle respectively.

Abstract: An open end wrench head including first and second jaws that are adapted to engage a workpiece located in a hard-to-reach area. The jaws can include a chamfered portion on the end of the jaws that allows the wrench to be presented at an angle to the workpiece and still maximize the engagement area between the wrench and the workpiece.

Abstract: An open-end wrench and a method of manufacturing the same are provided, the structure of which includes a body and a cover. The body includes a head portion and a handle portion, and the head portion includes a jaw portion and an opening formed at an inner side of the jaw portion. The cover includes a first plate, a second plate, and a third plate connecting the first plate and the second plate. An external surface of the third plate is formed to a wrench opening. A mouth is defined by external edges of the first plate, the second plate, and the third plate, and the mouth is penetrated by the jaw portion, so the cover wraps the jaw portion and the head portion is imbedded to the cover by using adhesive means.

Abstract: A wrench including an inward opening that has a multi-point configuration for partially-surrounding engagement in a torque-transmitting manner on a polygonal profile of a nut or a bolt head, a radial jaw opening being associated with the inward opening and at least two corners of the multi-point configuration each having a stop for a portion of an end face of the polygonal profile. In order to extend the range of use of the wrench, the jaw opening has oppositely-disposed jaw cheeks as the opening of an open-end wrench for torque-transmitting engagement on the polygonal profile, the jaw cheeks extending over the corners of the multi-point configuration on only one wide face (of the wrench).

Abstract: An open wrench includes a handle which is flat relative to a horizontal plane and a driving head is connected to the head. The driving head has a clamping opening with an opening communicating therewith. The driving head has two flat portions located on top and bottom of the driving head respectively and the flat portions each have an outer face, an inner face and a recess, all of which are located around the clamping opening and arranged in U shape. The inner face is located close to the clamping opening and the outer face is located close to the inner face. The outer face is raised, relative to the horizontal plane, from the mediate portion thereof and toward two ends of the outer face so as to define an inclined angle between the outer face and the horizontal plane.

Abstract: An open-end wrench includes a jaw portion having two engaging portions and an opening between the engaging portions. Each engaging portion includes a driving face having a tip. A corner is formed between a bottom end of the opening and each driving face. A first length is defined between the bottom end in a direction perpendicular to an imaginary line passing through the tips. A spacing between the tips is larger than 0.95 times the first length and smaller than 1.05 times the first length. Two corners of a fastener received in the opening are located on the imaginary line and flush with the tips. Each engaging portion has a width at an associated corner in a direction perpendicular to an associated driving face. The width is the maximum distance from each driving face to an outer surface of the associated engaging portion. The width is larger than 0.2975 times a width between two parallel sides of the fastener and smaller than 0.4025 times the width of the fastener.

Abstract: A grasping device comprising a grasping assembly coupled to a shaft adapted to fit into a drill chuck is described. Embodiments of the grasping device are capable of grasping objects such as a screw head, a bolt head, a hex nut, a wing nut, a hook, or other irregularly shaped objects, so that such objects can be turned by an electric drill, lathe, or similar machine tool.

Abstract: A tool for a connector that comprises a main body that has first and second opposite ends. The first end is configured to receive a torque device and has a substantially circular cross-sectional shape. The second end is configured to grasp a connector and has a substantially semi-circular cross-sectional shape, thereby defining an open side of the second end. The second end has at least one engagement member for engaging the connector.

Abstract: An open end wrench head including first and second jaws that are adapted to engage a workpiece located in a hard-to-reach area. The jaws can include a chamfered portion on the end of the jaws that allows the wrench to be presented at an angle to the workpiece and still maximize the engagement area between the wrench and the workpiece.

Abstract: An anti-slip wrench includes a handle having two opposite grip surfaces, and at least one slant slot formed on at least one of the grip surfaces of the handle. The slant slot is through the grip surface from one lateral surface of the handle to the other. The slant slot is a concave surface with two side edges, which meet the grip surface respectively. The slant slot is positioned at an included angle located between a slot axis of the slant slot and a longitudinal axis of the handle. The concave surface of the slant slot accommodates a thumb of a user when gripping the handle. The slant slot on the handle is provided to prevent the thumb from sliding longitudinally and transversely when gripping the handle.

Abstract: The present invention is related to an open-end wrench including a first jaw and a second jaw and a throat section connected between rear ends of the two jaws. A toothed section is disposed on the inner side of the first jaw. The toothed section has multiple sharp teeth and a wide tooth positioned behind the sharp teeth. The wide tooth has a largest width among all the teeth. The bottommost point of the throat section is spaced from a front end of the first jaw by a first length. The bottommost point of the throat section is spaced from the tooth crest of the wide tooth by a second length, which ranges from ? to ½ the first length. In addition, the toothed section has a third length, which is about ? the first length.

Abstract: A hand tool with adjustable swing angle includes a first and a second ends connected with each other to contain an adjustable angle. The first end has an upper wall section having a first splined hole and a lower wall section having a through hole. An annular groove is formed on a circumferential wall of the through hole. The second end is formed with a second splined hole positioned between the first splined hole and the through hole. An engagement member having a bulged section is positioned in the splined holes. An elastic restriction ring is positioned in the annular groove and has at least two holding sections positioned in the through hole. When moving the engagement member up and down, the elastic restriction ring is expanded by the bulged section, permitting the engagement member to engage with both the first and second ends or only the second end.

Abstract: A three-protuberance open-end wrench includes a head section. The head section has a first jaw and a second jaw. Two first protuberances are front and rear, side by side, formed on a holding face of the first jaw. A second protuberance is formed on a holding face of the second jaw. A throat is formed between the holding faces of the first and second jaws for receiving a threaded member therein. The protuberances of the first and second jaws serve to hold the threaded member. The protuberances form a non-isosceles triangle.

Abstract: Dual purpose water meter key configured to be utilized in the field to open both water meter covers and water meter shut off valves using one tool. The key can include both a pentagonal abscess and a parallel abscess, the former being used to manipulate a shaped nut associated with a water meter cover and open the water meter cover and the latter used to manipulate a water meter valve and thereby open or close it. A socket abscess can be located on the opposite side of the key to connect the key to receive a bar enabling a user to reach farther into locations behind a meter cover as well as a handle can be provided with the bar to enable a user to gain torque in the case of rusty systems.

Abstract: A ratchet device with stable structure includes a control unit, at least three receiving spaces defined on the top plane of the control unit, the receiving spaces communicating with each other, a pair of blockers and a elastomer located in each receiving space, a ratchet unit connected to the control unit, the ratchet unit having a spindle formed at one end thereof, a plurality of teeth formed around the periphery of the ratchet unit, the teeth engaged with the blockers of the control unit; a switching unit connected to the ratchet unit, at least three push sticks extruded from the bottom of the switching unit for pushing against the blockers. Therefore, the amounts of engaging faces among the blockers and the teeth are as enough as possible to make the engagement between the blockers and the teeth stable during an external torsion.

Abstract: An open-end wrench includes a jaw portion having two engaging portions and an opening between the engaging portions. Each engaging portion includes a driving face having a tip. A corner is formed between a bottom end of the opening and each driving face. A first length is defined between the bottom end in a direction perpendicular to an imaginary line passing through the tips. A spacing between the tips is larger than 0.95 times the first length and smaller than 1.05 times the first length. Two corners of a fastener received in the opening are located on the imaginary line and flush with the tips. Each engaging portion has a width at an associated corner in a direction perpendicular to an associated driving face. The width is the maximum distance from each driving face to an outer surface of the associated engaging portion. The width is larger than 0.2975 times a width between two parallel sides of the fastener and smaller than 0.4025 times the width of the fastener.

Abstract: A work piece turning tool is provided. The tool includes: a body having two ends; a gripper located at one end configured to grip a work piece; a handle located at the end opposite of the gripper; and tool attachment located at a base of the handle at the end of the tool, wherein the tool attachment includes both an exterior drive and an interior drive. A method of turning a work piece is provided. The method includes: attaching a first tool having a movable gripper end to the work piece; attaching a second tool to a drive mounted to the handle of the first tool; moving the first tool to a desired orientation with respect to the gripper; and turning the work piece by moving the second tool.

Abstract: An open end wrench includes a handle; and a spaced pair of jaws secured to and projecting from the handle, one of the jaws comprising a first engagement surface and a second engagement surface together arranged in an angled pair, and the other of the jaws comprising a third engagement surface, a fourth engagement surface spaced from the third engagement surface, and a concave surface between the third engagement surface and the fourth engagement surface, the third engagement surface being not parallel to the fourth engagement surface. The second engagement surface extends at an angle between 2-degree and 7-degree with respect to a virtual center line passing an opening between the pair of jaws. The fourth engagement surface extends at an angle between 2-degree and 5-degree with respect to the virtual center line. The second engagement surface is not parallel to the fourth engagement surface.

Abstract: A socket extension and related methods of utilizing a socket extension that improves upon conventional designs through the use of a shaped body allowing the socket extension to be manipulated with an appropriate tool at any point along the shaped body. Through the use of the shaped body, a user is provided multiple engagement points such that interference due to the proximity of other structures or other accessibility issues can be overcome. In addition, the shaped body presents the opportunity to utilize a plurality of tools on the same socket extension when additional force/torque is necessary to loosen and/or tighten a bolt.

Abstract: A wrench having multiple tool interfaces is provided. The wrench includes means for manually rotating about an axis located between the proximal and distal ends using a single force in a substantially tangential direction about the axis. The means for rotation might be a curve suitable for interface with a human finger. A method of rotating a tool is also provided.

Abstract: A speed wrench is disclosed having at least one recessive portion inside a speed wrench head of the speed wrench, and at least one engaging portion inside the speed wrench head. The speed wrench also has at least one angled portion providing an angled offset measured from a planar surface that the speed wrench is resting on to the center axis of the speed wrench head. The speed wrench may further be double-sided and may be an open-ended wrench.

Abstract: A rollup device can save users time and energy on the side of the road when rolling up belts or tie down straps which secure a load on a flatbed trailer. The rollup device may be a piece of metal having a fitting centrally located therewithin. The piece of metal may fit into a roll-up on the side of the flatbed trailer. A drill, such as a 12V cordless drill, may be used to turn the rollup device by fitting a drill bit into the centrally located fitting. Powering the drill may turn the roll-up device and, therefore, roll up the belts or straps.

Abstract: A wrench and wrench kit whereby a single connected unit is releasably attached and allows a user to access separate wrench handles from the detachment and further where said wrench handles are provided as a kit wherein attached handles have identical size wrench heads.

Abstract: An open-end wrench and a method of manufacturing the same are provided, the structure of which includes a body and a cover. The body includes a head portion and a handle portion, and the head portion includes a jaw portion and an opening formed at an inner side of the jaw portion. The cover includes a first plate, a second plate, and a third plate connecting the first plate and the second plate. An external surface of the third plate is formed to a wrench opening. A mouth is defined by external edges of the first plate, the second plate, and the third plate, and the mouth is penetrated by the jaw portion, so the cover wraps the jaw portion and the head portion is imbedded to the cover by using adhesive means.

Abstract: A combination ER wrench is disclosed for use in installing and tightening collet holders in connection with milling machines or machining centers. The disclosed wrench combines the function of multiple wrenches. The disclosed wrench has two open ends and two box ends that fit various collets and collet holders common in the industry, along with a box end to fit a retention knob. The open ends of the wrench have arcurate jaws and five points to contact the collet and/or collet nut. The box ends of the wrench are openings shaped to contact the collect and/or collet nut.

Abstract: The invention relates to hand tools that can be used in a variety of projects. Specifically, the invention relates to wrenches having two heads that are useful for repairing many different types of objects. The projects include motorcycle repair, automotive repair, small engine repair, general home repair, and appliance repair.

Abstract: The present invention is directed toward a dismantlable medical forceps system having a first grip having a movable grip part, a first force transmission element designed to transmit a first maximum force has a first connection element. A second force transmission element is designed to transmit a second maximum force greater than the first maximum force, the second force transmission element has a second connection element. The first grip has a coupling device for selectively force-fitting to the first or second connection elements of the first or second force transmission elements to the movable grip part. The first connection element has a first cross-section. The second connection element has a second cross-section different from the first cross-section. The coupling device has a first seat designed for a force-fit connection to the first connection element and a second seat designed for a force-fit connection to the second connection element.

Abstract: A wrench for a valve includes an elongated member having a first end portion and a second end portion. A first leg and a second leg are attached to the first end portion. The first leg and the second leg extend at an angle with respect to each other to form a gap therebetween. The first leg and second leg both having an inner surface for engaging with an outer surface of a bonnet and both legs having a front surface for engaging with a side surface of a rib attached to the outer surface of the bonnet. The wrench also including a handle attached to the second end portion.

Abstract: The invention relates to a setting tool for fasteners in the form of a hand-held tool, including a drive unit and a transfer and setting head that is drivably connected to the drive unit.

Abstract: An open ended wrench incorporating both English (inch) and metric sizes. Two conventional single-size wrenches are replaced by a dual-size hex pattern wrench, reducing the number of wrenches likely to be needed to do a job. One hex pattern is sized to match preferably a metric component and the other hex pattern is sized to match preferably an English component. The two different sized hex patterns are preferably offset by 30 degrees.

Abstract: A wrench including an inward opening that has a multi-point configuration for partially-surrounding engagement in a torque-transmitting manner on a polygonal profile of a nut or a bolt head, a radial jaw opening being associated with the inward opening and at least two corners of the multi-point configuration each having a stop for a portion of an end face of the polygonal profile. In order to extend the range of use of the wrench, the jaw opening has oppositely-disposed jaw cheeks as the opening of an open-end wrench for torque-transmitting engagement on the polygonal profile, the jaw cheeks extending over the corners of the multi-point configuration on only one wide face (of the wrench).

Abstract: A wrench head having a jaw with jaw members having interior side faces and throat support surfaces defining an interior for mateably receiving a nut or bolt head. Extending from the top side of each jaw member and the top side of a handle connection portion and overhanging the interior defined by the interior side faces of the jaw members and throat support surfaces is a wrench head overhang, that, when placed over a nut or bolt head, is in contact with the top side of the bolt head or top side of the nut. The wrench head overhang serves to retain the wrench head over the nut or bolt head so that the wrench head cannot slip down off of the nut or bolt head. The overhang is dimensioned so as to that when the wrench of the present invention is used to rotate a nut that has been threaded on a bolt shaft, the bolt shaft will clear the sides of the overhang.

Abstract: A method is disclosed for marking a socket. The method includes the steps of providing a socket, pressing the socket to make an indented mark, executing thermal treatment on the socket, coloring a portion of the socket near the indented mark to form a printed layer, vibrating and grinding the socket to remove the printed layer from the socket except the indented mark, and electroplating the socket to form a coating on an external side and an internal side of the socket.

Abstract: An identification structure of a tool with two colors includes a tool body having an engaging surface, and an identification ring. The identification ring is made of elastic polymer, composed of an inner layer and an outer layer having diverse colors. The identification ring is mounted around the engaging surface of the tool body, having the outer layer fitted in an intermediate portion of the inner layer to make an upper and a lower edge of the inner layer extending outside the outer layer. So, the two edges of the inner layer have the same color and the intermediate portion of the identification ring has two different colors, keeping them apt to be recognized.

Abstract: Tools for removing a cap from a filter housing, and an associated method are presented. A first tool is adapted for secure engagement with a cap of a filter assembly, while a second tool is adapted for engagement with the cylindrical body thereof. The first tool includes at least a pair of pin assemblies extending perpendicularly from the head of the tool. The second tool includes an annular plate characterized by circumferentially spaced notches adapted for receiving a cylindrical housing and particularly receiving and engaging ribs extending from such cylindrical housing. The application of opposite torques by the application of force to associated handles achieves the separation of the cap from the housing.

Abstract: A reversible open end wrench includes a handle, a head and a retainer. The head includes a first jaw, a second jaw and an extension section. The jaws and the extension section define a driving area therebetween. The first jaw has a first engaging surface and a distal end. The second jaw has a second engaging surface. The horizontal distance between the two engaging surfaces is s. The retainer is disposed on the distal end and has a retaining end extending toward the driving area. The retaining end is movable between a first position and a second position. As the retaining end locates at the first position, the horizontal distance between the retaining end and the second engaging surface is smaller than s. As the retaining end locates at the second position, the horizontal distance between the retaining end and the second engaging surface is no smaller than s.

Abstract: An eyelet outer ring assembly for use with footwear having a base member and various sized, shaped, and ornamentally designed detachable outer eyelet ring with attachment means permanently connected to either base member and/or outer eyelet ring that are detachably secured. Base member and/or eyelet outer ring attachment means protrude partially or fully through eyelet holes of footwear. Each outer eyelet ring may contain functional grooved configurations to accommodate various fastening tool's prong or prongs and may be placed in an ornamentally desired manner. A fastening tool with a handle is used to create torque for fastening said base member and outer eyelet ring. In desirable instances, the fastening tool's prong or prongs are made of or coated with material that is durable but will not harm or scratch said eyelet assemblies.

Abstract: A rollup device can save users time and energy on the side of the road when rolling up belts or tie down straps which secure a load on a flatbed trailer. The rollup device may be a piece of metal having a fitting centrally located therewithin. The piece of metal may fit into a roll-up on the side of the flatbed trailer. A drill, such as a 12V cordless drill, may be used to turn the rollup device by fitting a drill bit into the centrally located fitting. Powering the drill may turn the roll-up device and, therefore, roll up the belts or straps.

Abstract: A pawl disengagement tool intended for use with a slack adjuster has an elongated handle with a first end and an opposite second end, and a longitudinal axis extending from the first end to the second end. A slotted aperture formed at the first end includes a hole with a diameter that is greater than the first diameter of the pawl cap. A first slot extends from the hole and has a width that is greater than the second diameter of the pawl shaft of the pawl assembly of the slack adjuster. A portion of the tool defining the hole includes a chamfered periphery. The chamfered periphery defines an inclined plane leading to the first slot. The inclined plane has a thickness that increases up to a thickness equal to a disengagement thickness. The disengagement thickness is effective to cause disengagement of the pawl assembly. The second end of the tool includes a forked end that includes a pair of parallel spaced apart wedge-shaped prongs. In use, the forked end or slotted aperture is manipulated (e.g.

Abstract: A method for identifying tools using the steps of providing a tool, wherein the tool is chosen from the group including a wrench, a socket, a nut, and a bolt; applying an indicator being a color-coded indicia onto the tool, wherein the indicia is visible to a user, wherein the indicia aids in identifying the tool, wherein the colors are chosen from the group including blue, red, orange, yellow, green, brown, violet and light gray; wherein the indicia is a band, the band being substantially flat, the band being raised an effective distance above the surface of the tool, wherein the band can be felt by a user, wherein the band aids in identifying the tool; and, wherein the band has a single portion, wherein the single portion can be felt by a user to identify English size tools. The method uses a band having two interconnected portions, wherein the two interconnected portions can be felt by a user to aid in identifying metric size tools.

Abstract: A symmetrical open-end wrench having rear side corners adjacent open ends of the throat of the wrench and opposing jaws defining an opening for receiving a fastener, the jaws having parallel planar section, and continuously diverging surfaces with fastener-engaging irregularities merging with the respective rear side corners in a smooth transition.