Park Tool BBT-47-16-Notch Bottom Bracket Tool Description: The Park Tool BBT-47 16-Notch Bottom Bracket Tool is a precision CNC-machined aluminum tool for installing and removing threaded bottom brackets with 16-notch fittings. Manufactured and anodized for easy identification, it's compatible with 3/8" ratchet and torque wrenches. Features: Fits 16-notch threaded bottom bracket tool fittings with a major diameter of 52 - 54mm (outside of notches) and a minor diameter of 48.8mm (inside of notches) 3/8" drive ratchet and torque wrench compatible Compatibility: C-Bear T45 (24mm, 30mm, and DUB) C-Bear T47-BB86 CeramicSpeed T47/86 Enduro BB30/30a TorqTire (30mm and DUB spindles) Enduro T47 (30mm and DUB spindles) Kogel T47 SRAM T47 DUB White Industries PF30 Thread-Together White Industries T47