- A spanner is a tool used to turn bolts and nuts. It comprises a looped metal shaft, usually ending in a handle, with a metal wedge-shaped tip that fits into the slots of the nuts or bolts.
- The slot in the spanner is either straight or has a slightly larger diameter than the bolt being tightened; when the wedge is inserted into this slot, it prevents the spanners from turning, allowing the user to apply more force. There are many different shapes and sizes of spanners, each suited to a particular use.
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