Bottom brackets occasionally require removal for service, replacement, or upgrading. The Park Tool BBT-32 is compatible with bottom brackets with 20 splines and a diameter of 32 mm. This fitting is found on many models of cartridge bottom brackets, including Shimano , Truvativ , RaceFace , FSA , and others. Also fits some models of crankset lockrings including Race FaceA(R). The tool clears the oversized spindles of ISIS Drive and Octalink cranksets. Can be driven using an adjustable wrench or 32 mm socket.