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Wrench
tool used to provide grip and mechanical advantage / From Wikipedia, the free encyclopedia
A wrench (or spanner) is a tool used to provide grip and turn nuts and bolts, and similarly shaped objects.
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In British English, spanner is the standard term. The most common shapes are called open-ended spanner and ring spanner. The term wrench is generally used for tools that turn non-fastening devices (e.g. tap wrench and pipe wrench), or may be used for a monkey wrench – an adjustable spanner.
What a wrench or spanner does is to grip. Pulling or pushing the handle to rotate gives mechanical advantage. It applies torque to turn objects – usually rotary fasteners, such as nuts and bolts – or keep them from turning.