A wrench is a common installation and disassembly tool. It is a manual tool used to turn bolts, screws, nuts and other threads to hold bolts or nuts. Wrenches are usually made of carbon or alloy structural steel.
Wrench usually at one end of the handle or both ends of the system clamping bolt or nut opening or sleeve hole, when using along the direction of thread rotation in the handle to apply external force, can turn the bolt or nut.
