The wrench is a hand tool that uses the principle of the lever to turn bolts, screws, nuts, and other threads to hold the openings or sleeve holes of bolts or nuts. The wrench usually has a shank portion at one or both ends, which is used to apply external force to turn the bolt or nut to hold the opening or sleeve hole of the bolt or nut. When the shank portion is used to apply external force along the direction of thread rotation, the bolt or nut can be turned. Wrenches are usually made of carbon or alloy structural steel. Chromium-vanadium (with the element symbol of Cr-V) steel is used in this site.
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