The Campagnolo UT-BB120 tool has one simple purpose: The installation of Campagnolo Ultra Torque Bottom Bracket cups. This is the exact tool cited for this purpose by Campy in the owner's manual for the UT BB. Its splines precisely mate to the teeth on out outside of the UT BB cups, and by using it you minimize your chances of chewing up the cups and marring the look of your new drivetrain. The rubberized handle keeps hand pain to a minimum as you crank down on the cups.