Park Tool Bottom Bracket Tool BBT-79.3The Bottom Bracket Tool BBT-79.3 from Park Tool is a high-quality bottom bracket tool that is ideal for use with a wide range of 12-notch external cup bottom brackets.A precision CNC-machined aluminium 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. Manufactured in-house by Park Tool, anodized for easy identification and featuring a ratchet/torque wrench-compatible 3/8" drive.The BBT-79.3 features integrated threads for full compatibility with the Park Tool BBT-RS Bottom Bracket Tool Retaining System (sold separately). The BBT-RS uses an adjustable spring-based tension system to apply consistent, adjustable pressure to the tool, ensuring full engagement with the tool fitting and preventing slippage.Features 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 Compatibility Includes: SRAM BSA DUB; Race Face Cinch; Rotor BSA30; Zipp Vuma; Hawk Racing BB3086 and more 3/8" drive fittingBuy Park Tool Workshop from Chain Reaction Cycles, the World's Largest Online Bike Store.