BOTTOM BRACKET PARK BBT-79.3 12-NOTCHx45-47mm f/EXT DUB BOTTOM BRACKET CUPPrecision CNC machined aluminum tool for the installation and removal of select threaded bottom brackets with 12 notch tool fittings, including SRAM BSA DUB, Race Face Cinch, Rotor BSA30 and others Fits 12 notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 45 47 mm and a minor diameter (inside of notches) of 44 mm Features integrated threads for full compatibility with the Park Tool BBT RS Bottom Bracket Tool