Wrench is a kind of commonly used installation and disassembly tool. It is a manual tool that uses lever principle to turn bolts, screws, nuts and other threads to hold the opening or sleeve hole fastener of bolts or nuts. Spanners are usually made of carbon or alloy structural steel.
The wrench usually has an opening or sleeve hole at one or both ends of the handle to hold the bolt or nut. When used, the wrench can turn the bolt or nut by applying external force on the handle along the direction of thread rotation.
