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An adjustable wrench is a type of tool, typically operated by hand, used for tightening bolts and nuts. It is similar to an open-end wrench but features one fixed jaw and one adjustable jaw. This design allows it to accommodate various sizes of bolts and nuts within a certain range.123

The adjustable jaw is moved by turning a worm that engages teeth on the jaw. This type of wrench is also known as a monkey wrench or, in British English, an adjustable spanner. An adjustable pipe wrench is a variation with serrated jaws designed for gripping round objects like pipes.34

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