This bicycle-specific tool is used to install and remove square taper bottom bracket cups from Campagnolo. This tool is also used to remove the Campagnolo cassette locking ring.

There are versions available with their own handle or versions which can be rotated by a socket wrench or torque wrench.

Bottom brackets which use this type of tool:

Campagnolo square taper – all model

Cassette lockrings which use this type of tool:

Campagnolo – all models from 8 speed to 11 speed.