Bottom brackets occasionally require removal for service, replacement, or upgrading. The Park Tool BBT-22 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 Face. The tool clears the oversized spindles of ISIS Drive and Octalink cranksets. The high-grade tool steel body utilizes a flat tooth profile to ensure maximum engagement with bottom bracket cups. Can be driven using a wrench, socket, or 3/8″ drive wrench.