A long bar with a socket on the end for tightening bolts.
- Consider a multi-wrench for those all-purpose jobs, but also add a pipe wrench, a spud wrench, strap and chain wrench, and a monkey wrench.
- Box end spud wrenches are used primarily for the final tightening and loosening of fasteners.
- The bolt is tightened further by either hammering on the spud wrench or using a pneumatic impact wrench until the rotating part has rotated the required amount.
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