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- DictionarySock·et wrench/ˈsäkət renCH/
noun
- 1. a ratchet tool with a series of detachable sockets for tightening and loosening nuts of different sizes.
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noun
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Type of wrench, often hexagonal, where the toolhead encloses the screw head of the bolt or nut
A socket wrench (or socket spanner) is a type of spanner (or wrench in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt. The most prevalent form is the ratcheting socket wrench, often informally called a ratchet. Wikipedia