Precision CNC machined aluminum tool for the installation and removal of 12-notch external bearing bottom brackets. Anodized for easy identification and featuring a ratchet/torque wrench compatible 3/8" drive. Features: Fits 12-notch bottom bracket tool fittings with a major diameter of 45-47mm and a minor diameter of 44mm 3/8" drive compatibility SRAM BSA Dub, Race Face(R) Cinch(TM), Rotor(R) BSA30, Zipp(R) Vuma(TM), Hawk Racing(TM) BB3086(TM), and more