Park Tool Bottom Bracket Tool BBT-79.3 A precision 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. Manufactured in-house by Park Tool, anodized for easy identification and featuring a ratchet/torque wrench-compatible 3/8" drive. 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, including:SRAM® BSA DUB® Race Face® Cinch® Rotor® BSA30 Zipp® Vuma™ Hawk Racing™ BB3086™ and more 3/8" drive fitting WARNING: California Proposition 65 This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm. https://cambriabike.com/pages/warning-california-proposition-65