Auto repair wrench is the most commonly used tool, mainly used to twist one of the bolts, nuts or threaded parts. If the wrench is improperly selected or used, it will not only cause damage to the workpiece and a wrench, but also cause accidents and endanger personal safety. Therefore, the proper selection and use of wrenches are very important.
Socket wrenches use lever painful bolts, screws, nuts and other threaded bolts or nut sleeves to hold openings or hole fasteners as hand tools. The wrench is usually made at one or both ends of the clamping rod with an external force applied to the handle to force the handle, bolt or nut to hold the opening or hole of the twisting sleeve. When using the force applied along the direction of rotation of the threaded rod can be screwed into the bolt or nut. Wrenches are usually made of carbon steel or alloy steel.