Abstract: A wrench combination device includes three open-jawed wrench sockets. A first open jawed wrench socket is at one end of the device, and a second open jawed wrench socket, which is substantially identical to the first, is at an extreme opposite end. A third open jawed wrench socket is centered between and is inline with the first and second open-jawed wrench sockets, and has two portals. The first portal is open at two opposite ends and extends normal to a plane passing through the first and second open jawed wrench sockets. The second portal opens on one side of the third socket and extends in the plane passing through the first and second open jawed wrench sockets.

Abstract: Apparatuses and methods for facilitating fastening of a fastener are provided. In one example, the apparatus includes a body portion that extends distally from a body proximal portion to a body distal portion. A head portion extends distally from the body distal portion. A first prong that extends distally from a first prong proximal section that has a first thickness to a first prong distal section that has a second thickness that is less than the first thickness. A second prong that extends distally from a second prong proximal section that has a third thickness to a second prong distal section that has a fourth thickness that is less than the third thickness. The second prong is spaced apart from the first prong to define a gap therebetween that is configured to receive the fastener.

Abstract: The present invention relates in general to the field of high voltage power line insulators, and more specifically, to a tool for installing high voltage power line insulators and a method of use. The installation tool includes a feature that allows a lineworker to safely install high voltage power line insulators of different shapes and sizes using the same installation tool. In particular, the installation tool comprises differently sized sockets that correspond to the distinct head size dimensions of different types of high voltage power line insulators. A purpose of the invention is to provide a tool for installing high voltage power line insulators and a method of use that minimizes risk of injury to the lineworker during installation, is easy to use, and cost-effective to manufacture.

Abstract: A multi wrench with tool heads rotationally coupled to the outer circumference of at least one end of a handle. The tool heads are comprised of spanners, sockets, ratchet sockets and nested spanners and sockets. The tool heads are operational in all positions for best comfortable use, with some positions giving best clear vision of operation. Another variation of the invention is a frame with tool heads rotationally coupled to its outer circumference. One side has a stud or a hole which engages a hole or a stud of a conventional handle. While the other side has a stud or a hole which engages a hole or a stud of a conventional tool.

Abstract: The present invention relates to a drill guide (1) for use in the dental field. It comprises a grip (5) and at least two guide sleeves (10) arranged on the grip, the grip (5) having a top face (25) and an underside (30) and the underside (30) of the grip being intended to bear at least partially on a drill jig. The at least two guide sleeves (10) protrude from the underside (30) of the grip, and at least one limit stop (55), which is an axial continuation of one of the at least two guide sleeves (10), protrudes from the top face (25) of the grip.

Abstract: Method and apparatus for fastening rotatable items. A hand tool including two rows of teeth are used to grip fasteners such as lug nuts, screws and bolts. The teeth are located within a slotted region of the handle of the hand tool. Because the slotted region is within the handle, when rotated, both a lateral torque force and a sagittal pressing force is applied to the fastener. This combination of forces makes fasting easier and more efficient.

Abstract: Disclosed is a rock bolt installation tool for installation of a rock bolt assembly into a predrilled rock hole. The tool includes a drive shaft having a proximal end, which is adapted to engage with a drill rig, and a distal end. A socket in the distal end includes a first containment portion, of a first diameter, which has a base and a second containment portion, of a second diameter, between the first containment portion and the second end. The first containment portion is adapted to receive a nut of the rock bolt assembly. The second containment portion is adapted to receive a load-indicator of the rock bolt assembly. The base and the second end are adapted to provide surfaces against which the nut and a spherical seat of the rock bolt assembly respectively engage to be driven into the rock hole.

Abstract: A multi-fastener wrench for simultaneously or concurrently holding a plurality of fasteners, wherein the wrench comprises a handle having a distal end and a proximal end, and two sets of jaws at or new the distal end. The jaws may be movably coupled to the handle, allowing the user to vary the distance between the jaws.

Abstract: An angle stop wrench with an open first end sized for holding a plumbing component during an installation procedure. A side opening of a different size from the open first end is also included in the angle stop wrench for holding a plumbing component during the installation procedure. Finally, a hook end portion for holding and aligning a plumbing component during the installation procedure is also provided, where the hook portion is formed on an end portion spaced from the open first end portion. The angle stop wrench may be secured for storage within the handle of a second tool useful in the installation procedure.

Abstract: A folding multifunction wrench for tightening or loosening a plurality of different sized rotary fasteners, comprising at least two wrench heads attached to their own respective wrench arm with the wrench arms pivotally mounted together at a hinge and pivotal (foldable) to a smaller stowed position or extend to a larger operational position. Individual wrench arms can be used either as a wrench handle or as a wrench tool depending on which end of the wrench the user grasps. During use, the rotational axes of the gripping surfaces on the wrench head can be oriented within ten degrees of being perpendicular to the hinge axis of the two or more wrench arms, whereby torque can be transmitted across the hinge axis for turning the plurality of different sized rotary fastener.

Abstract: The present invention is to provide a double-ended wrench set with identical torque holes, which comprises at least two double-ended wrenches having torque holes of a same configuration and a torque rod comprising a torque body and a torque head perpendicularly connected to the torque body, wherein each said torque hole is located in a wrench body of the double-ended wrench, the torque body has a greater length than the torque head, and the torque head has a cross section identical in configuration to the torque hole and is able to be fitted into said torque hole.

Abstract: An electronic torque wrench includes: a shank body, a drive head being connected with a front end of the shank body; a handle having a front handle section and a rear handle section, the front handle section being connected with a rear end of the shank body, a cell room being formed in the front handle section for placing cells therein, a front end of the rear handle section being detachably connected with the rear end of the front handle section; an electronic operation/control device disposed on the shank body; and at least one torque sensor mounted on the shank body. The front and rear handle sections together form the handle for a user to hold. The rear handle section of the handle serves as a cell cap for closing the cell room so as to shorten the length of the wrench.

Abstract: A tool, a tool system, and method for applying torque to a hammer union. The tool includes a handle attached to a tool head, and the tool head further includes at least two indentations, the indentations having a curved rearward wall and forming a mouth with a first width and a mid-section with a second width, wherein the mid-section width is greater than the mouth width.

Abstract: A tool is configured to receive a locknut of a coaxial cable. The tool includes a sleeve provided with a first inner hole therein; a first block in the first inner hole, wherein the first block has a gradually small cross-sectional area from top to bottom in an axis of the first inner hole; a second block in the first inner hole, wherein the second block has a gradually small cross-sectional area from top to bottom in the axis of the first inner hole; and a third block in the first inner hole, wherein the third block has a gradually small cross-sectional area from bottom to top in the axis of the first inner hole, wherein the third block is configured to be between the first and second blocks, wherein the third block has a first surface configured to contact the first block and a second surface configured to contact the second block.

Abstract: A wrench device includes a first handle and a second handle. The first handle has a pivotal connecting segment and a driving head defined at two ends thereof respectively. The pivotal connecting segment has a groove defined around an outer periphery thereof. The second handle has a pivotal connecting recess and a driving part defined at two ends thereof respectively. The pivotal connecting segment of the first handle is pivotally inserted into the pivotal connecting recess of the second handle. The second handle has a side screwed hole opened on a surface therethrough. The side screwed hole communicates with the pivotal connecting recess and corresponds to the groove. A position member is screwed into the side screwed hole. Therefore, when either the driving head or the driving part is broken, the first handle and the second handle can be separated by unscrewing the position member from the side screwed hole.

Abstract: An open-end wrench includes a handle and a driver. The driver is connected with an end of the handle for providing a torque for a work piece. The driver includes two jaw portions and at least one inclined plane. The two jaw portions are formed on two sides of a front side of the driver, and are spaced for forming an opening. The inclined plane is formed on the driver and inclines from a center of the driver to an edge of the driver, and inclines across one of the jaw portions, and inclines from a connecting portion between the handle and the driver to the front end of the driver.

Abstract: A wrench includes a handle, a first driver, and a second driver. The first driver and the second driver are integrally connected to two ends of the handle respectively. An angle between a driving axis of the first driver and a central axis of the handle is ?, an angle between one opening end of the first driver and the handle is ?, an angle between a driving axis of the second driver and the central axis of the handle is ?, and an angle between one opening end of the second driver and the handle is ?. The angle ? and the angle ? are located at two sides of the central axis of the handle respectively. The other opening end of the first driver and the other opening end of the second driver are horizontally connected to the handle respectively.

Abstract: A wrench includes a handle, a first driver and a second driver. The first driver and the second driver are integrally connected to the ends of the handle respectively. One opening end of the first driver and one opening end of the second driver are horizontally connected to two ends of the handle respectively. The second driver is hollow tube-shaped and has a plurality of first teeth and a plurality of second teeth located on an inner wall thereof. Two angles are between two opening ends of the second driver and the first teeth and the second teeth respectively, and the angles are from 75 degrees to 105 degrees.

Abstract: Magnetic Wrench can provide people with a convenient way to install and remove nuts and bolts with a wrench without the nut or bolt slipping out of the wrench and falling onto the floor. This unique product can comprise a wrench with built-in, internal magnets on the openings on both ends. The magnets comprise three small washers placed around the wrench's openings, or a magnetic strip that can follow the curve of the opening. This concept can be applied to both metric and standard wrenches, as well as various shapes and sizes of wrenches. The exact specifications, materials used, and method of use of Magnetic Wrench may vary upon manufacturing.

Abstract: A wrench is specifically configured for removing and installing toilet seats to toilet bowls, where a single wrench is adaptable to be used with a variety of different nuts commonly utilized to secure toilet seats to bowls. Each end of the wrench is configured to receive and engage a different variety of nut. Additional nut varieties may be received and engaged through the use of plug inserts which are received in each end of the wrench. The outer profiles of the plug inserts correspond to the internal profiles of each end of the wrench, while the internal profiles of the plug inserts are configured to receive and engage other sizes and forms of nuts. A method of use utilizes the wrench.

Abstract: An open wrench includes integral handle and first driving head. The first driving head has a U-shaped body which has a mounting hole defined therein and an opening communicates with the mounting hole. Each of top surface and bottom surface of the first driving head has a first face and a second face. The second face is a U-shaped face and located along with the mounting hole. The first face is a U-shaped face and located outside of the second face. A U-shaped groove is defined between the first and second faces.

Abstract: The present invention discloses a complex wrench composed of a strip-shaped shank which includes a front section, a middle section and a rear section along its length direction in order thereof, the front section and the rear section connecting a first driving head and a second driving head respectively, the middle section being a twisted section which makes the axis lines of the first driving head and the second driving head on different planes, and the middle section having at least one sunken area where is covered with a plurality of embossed patterns.

Abstract: An open wrench includes integral handle and first driving head. The first driving head has a U-shaped body which has a mounting hole defined therein and an opening communicates with the mounting hole. Each of top surface and bottom surface of the first driving head has a first face and a second face. The second face is a U-shaped face and located along with the mounting hole. The first face is a U-shaped face and located outside of the second face. A U-shaped groove is defined between the first and second faces.

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: A wrench includes a handle, a first driver, and a second driver. The first driver and the second driver are integrally connected to two ends of the handle respectively. An angle between a driving axis of the first driver and a central axis of the handle is ?, an angle between one opening end of the first driver and the handle is ?, an angle between a driving axis of the second driver and the central axis of the handle is ?, and an angle between one opening end of the second driver and the handle is ?. The angle ? and the angle ? are located at two sides of the central axis of the handle respectively. The other opening end of the first driver and the other opening end of the second driver are horizontally connected to the handle respectively.

Abstract: A hand-held tool for individuals who have diminished use of their hands or reduced gripping strength due to infirmity or medical condition that provides a number of shaped spaces for seating and manipulation of various items that would otherwise be difficult or impossible to manipulate. Among the multiple shaped spaces is a space for a writing instrument and a space for an eating utensil enabling a user to write and eat without for example, directly gripping a pencil or a fork.

Abstract: A barrel holder apparatus for intervertebral disc prosthesis implantation, the apparatus comprising a first end having one or more apertures shaped to hold removable pins while the prosthesis is being implanted to prevent a first disc and a second disc of the prosthesis from separating, the removable pins being pre-threaded into the first disc and the second disc of the prosthesis prior to the implantation of the prosthesis, and a second end located opposite to the first end, the second end having an opening shaped to hold one of the removable pins while the barrel holder is being rotated to unthread the removable pin out of the prosthesis after the implantation is completed. Also provided is a method for implanting intervertebral disc prosthesis into an intervertebral disc area defined between adjacent cervical vertebrae, the method comprising threading removable pins into a first disc and a second disc of the prosthesis.

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: 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: The present invention discloses a complex wrench composed of a strip-shaped shank which includes a front section, a middle section and a rear section along its length direction in order thereof, the front section and the rear section connecting a first driving head and a second driving head respectively, the middle section being a twisted section which makes the axis lines of the first driving head and the second driving head on different planes, and the middle section having at least one sunken area where is covered with a plurality of embossed patterns.

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: 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: An open end wrench having a shank with a smooth planar side, the length of the shank, that functions as a torqueing jaw of opposed wrench heads formed at opposite ends of said shank. The opposing wrench heads are each defined by two jaws, one of which is the smooth planar surface of the shank, and an arcuate throat interconnecting the jaws.

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 wrench for different-sized nuts includes a handle having an opening at a first end thereof and a slot communicated with the opening, an adjustment screw threadedly inserted into the handle and passing through the slot for adjusting a gap of the slot, a first working head rotatably connected with the first end of the handle in such a way that one of first and second mounting portions of the first working head is selectively positionable in the opening of the first end of the handle, and different-sized first and second ratchet sockets rotatably and respectively mounted with the first and second mounting portions. By means of the adjustment screw, the rotationability of the first working head relative to the first end of the handle can be adjusted.

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: A socket wrench device having multiple adjustable fastener engagement tool ends. A pair of ratchet engagement heads are pivotally secured in respective rotational and supportive orientation with extending handles pivoted together at their free ends to afford multiple socket engagement orientation by compound pivot and socket rotation within a single hand tool configuration.

Abstract: A combination wrench includes a shank, a first driving member mounted on a first end of the shank, and a second driving member mounted on a second end of the shank. The shank has different cross-sectional profiles and areas from the first driving member to the second driving member so that the shank has different thickness from the first driving member to the second driving member so as to correspond to different forces. Thus, the mediate portion of the shank has a uniform thickness and has greater strength and torque so as to withstand a larger force so that when a stress is concentrated on the mediate portion of the shank, the mediate portion of the shank can tolerate the stress, thereby preventing the shank from being deformed or broken due to an excessive force.

Abstract: A multi-functional jaw wrench combined with self adjusting socket is provided. The multi-functional jaw wrench is comprised of one fixed jaw and one movable jaw at the first end of the handle and a self-adjustable socket that is rotatably attached on the second end of the handle. The self-adjustable socket comprises of many small diameter pins arranged inside of a bore surrounding a six phased rod placed at the center of the bore. The self-adjustable socket is rotatably engaged to a circular gears developed inside of a hole of a socket receiver that is developed on the second end of the handle via a socket head section. Another embodiment of the current invention of the self-adjustable socket receiver can be folded ±90 degrees to align the socket with the handle and enables a user reach a bolts located inside of a structure.

Abstract: A multipurpose rescue tool comprising a unitary metallic sheet member of a uniform diameter having an L-shaped hook portion, a grip portion with U-shaped finger guard, and a flared base portion. The head of the hook portion has pivot notches formed within the peripheral edge, a first end tapered to an acute tip, and a second end comprising a spanner wrench opening. The base portion includes opposed V-shaped flanges for improved grip and a gas valve shut-off aperture. Balanced weight distribution, size and overall tool weight render it capable of storage and transport within a responder's turnouts for efficient use regardless of hand size or strength, in striking, peeling, screw driver, hammer, pry bar, spanner-wrench and valve stem applications.

Abstract: A multi-size wrench is defined with an engaging hole in a head thereof, and an inner surface of the engaging hole of the head is formed by six arc-shaped engaging concaves and six arc-shaped connecting convexes which are alternatively connected to each other in such a manner that between each two neighboring engaging concaves is connected a connecting convexes. An angle between the connecting lines from two ends of the respective arc-shaped engaging concaves to the center of the engaging hole is 50 degrees, and an angle between the connecting lines from the center of the engaging hole to a middle connecting point of each arc-shaped connecting convexes and to a connecting end of the connecting convex is 5 degrees. By such arrangements, the multi-size wrench is applicable to a Metric hexagonal fastener, an English hexagonal fastener and a torx fastener which are correspondingly sized.

Abstract: A multiple socket ratcheting wrench is described comprising an elongate handle with a first end and a second end. A first mounting element connected to the first end and a second mounting element connected to the second end. A first holder element rotatably attached by a first pin to the first mounting element is provided, wherein the first holder is capable of rotating at least 180 degrees about the first pin, the first holder element defining a first opening and a second opening. The first opening receives a first socket and a second socket, and the second opening receives a third socket and a fourth socket. A first ratcheting means is attached to the first holder element and is configured to control torque direction of the first socket and the second socket, and a second ratcheting means is attached to the first holder element and is configured to control torque direction of the third socket and the fourth socket.

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 wrench for different-sized nuts includes a handle having an opening at a first end thereof and a slot communicated with the opening, an adjustment screw threadedly inserted into the handle and passing through the slot for adjusting a gap of the slot, a first working head rotatably connected with the first end of the handle in such a way that one of first and second mounting portions of the first working head is selectively positionable in the opening of the first end of the handle, and different-sized first and second ratchet sockets rotatably and respectively mounted with the first and second mounting portions. By means of the adjustment screw, the rotationability of the first working head relative to the first end of the handle can be adjusted.

Abstract: A wrench assembly and a method of use are disclosed herein. A wrench assembly for handling one or more work pieces may include a handle, a first drive member connected to a first end of the handle, and a second drive member connected to a second end of the handle. The first and second drive members may each have a plurality of drives configured to engage and transmit torque to one or more work pieces. The drive members may include a spline configuration operable to engage work pieces having different shapes of engagement surfaces. A method of handling a work piece using the wrench assembly may include engaging one or more of the work pieces with the spline configuration of the drive members and transmitting torque to the work piece by applying a force to the wrench assembly.

Abstract: A tool includes a first and a second socket wrench pivotally turnably connected to two ends of a link. Each of the first and second socket wrenches includes a wrench portion and a circular end portion having an axial slot extended through them. The wrench portion of the first socket wrench is internally formed of a hexagonally shaped portion for fitting around a hexagonally-shaped outer surface of a connecting ring of a male F connector to tighten or loosen the connecting ring to or from a female F connector, and the wrench portion of the second socket wrench is internally formed of a constant-torque shaped portion for fitting around the hexagonally-shaped outer surface of the connecting ring to prevent the tool from applying an excessive torque on the connecting ring when turning the same. The tool can be used without being hindered by bent or closely arranged cables.

Abstract: Watts Magnetic Wrench provides consumers with a wrench having an embedded magnet that substantially prevents the tool, nuts and bolts from being dropped when being loosened or tightened. This tool may be available in a variety of sizes to accommodate user preferences. The magnet(s) may be heavy duty and strong enough to sufficiently hold the tool to bolts and nuts and vice versa. The magnet is typically flush with the body of the tooling so as to keep the tooling as compact as possible thereby enabling it to function reliably inside confined areas.

Abstract: A combination open-ended ratcheting wrench with a box-end wrench has a wrench having a wrench head, the wrench head having a first aperture with a first opening, a receptacle formed at an inner wall of the first aperture, at least one limiting groove disposed around the inner wall of the first aperture; a control member pushing against an elastic member acceptable in the receptacle and having a ratcheting surface and a smooth surface, and at least one stopping edge corresponding to and accepting the limiting members; a ratchet disposed in the first aperture and having a ratcheting aperture, the ratcheting aperture having a ratchet opening, a ratcheting pawl formed around an outer circumference of the ratchet and corresponding to the ratcheting surface of the control member; and a rotation cap disposed on the wrench head covering a portion of the ratchet in the first aperture and having a second opening.

Abstract: A device for installing and removing light bulbs. The device preferably comprises a tubular or frustoconical body with a detachable ring positioned proximately to one of the terminal ends. The ring includes a flexible mesh material positioned in covering relation to the opening at the terminal end for frictionally engaging a light bulb of various sizes and shapes. The device can further incorporate an extension attachment for changing light bulbs positioned in elevated locations or means for convenient storage and transportation.

Abstract: A wrench of the present invention includes a main body having a handle and a driving portion. The main body is made from aluminum alloy, which consists of Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti and Al. Specifically, the aluminum alloy has less than 1% by weight of Si, less than 1% by weight of Fe, 1-5% by weight of Cu, less than 1% by weight of Mn, 2-5% by weight of Mg, less than 1% by weight of Cr, 5-9% by weight of Zn and less than 1% by weight of and the rest part thereof is Al.