Park Tool BBT-47-12 Bottom Bracket Tool Description: The Park Tool BBT-47-12 is a precision CNC-machined aluminum tool for the installation and removal of select bottom brackets with 12-notch tool fittings, including Chris King ThreadFit T47 and ThreadFit 30 bottom bracket. Anodized for easy identification and features a ratchet/torque wrench-compatible 3/8" drive. Features: Heavy duty shop quality bottom bracket tool A precision CNC-machined aluminum tool for the installation and removal of select threaded bottom brackets with 12-notch tool fittings, including Chris King ThreadFit T47 and ThreadFit 30 Fits 12-notch bottom bracket tool fittings with a major diameter of 48-50mm and a minor diameter of 48.2mm 3/8" drive compatibility Compatible with the following bottom bracket standards: BBInfinite T47 Chris King ThreadFit T47 Chris King ThreadFit 30 Hambini T47 Rotor T47 External 30 mm Rotor BBright Rotor BB30 Rotor BB386EVO Rotor PF30 Thread-Together