20mm Chrome Vanadium Ratchet Combination Spanner Wrench

A wrench is a commonly used installation and removal tool. It is a hand tool that uses the principle of leverage to turn bolts, screws, nuts and other threaded fastening bolts or nuts. Wrenches are usually made of carbon or alloy structural steel.The wrench usually has openings or sleeve holes for holding the bolt or nut at one or both ends of the shank. When in use, an external force is applied to the shank in the direction of thread rotation to turn the bolt or nut. There are basically two types of wrenches, dead wrenches and adjustable wrenches. The former refers to the wrench that has a fixed number written on it, and the latter is the adjustable wrench.