Park Tool Bottom Bracket Tool BBT-27.3 A precision CNC-machined aluminum tool for the installation and removal of select threaded bottom brackets with 16-notch tool fittings, including FSA® MegaEvo®, Wheels Manufacturing™ T47, & Wheels Manufacturing™ PF30. Manufactured in-house by Park Tool, anodized for easy identification and featuring a ratchet/torque wrench-compatible 3/8" drive. Fits 16-notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 48-50 mm and a minor diameter (inside of notches) of 46.4 mm, including: FSA® MegaEvo® Wheels Manufacturing™ T47 Wheels Manufacturing™ PF30 NOTE: The BBT-27.3 does not fit Hope™ BSA30. 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