Unior Bottom Bracket Wrench Key Features The tool has a professional double injected plastic handle, which enables strong grip and great comfort. Wrench is used to install or remove BSA30 external cups. Can also be used with a 1/2" torque wrench. Unior's BSA30 bottom bracket wrench works on the new BSA30 standard bottom brackets which you can find on RotorR, DUB, ZippR and RaceFaceR systems.