Park Tool BBT-59.3

Bottom Bracket Tool — 16-Notch Precision CNC-machined aluminum tool for the installation and removal of select threaded bottom brackets with 16-notch tool fittings, including Shimano® Ultegra® BBR60 and Deore XT® MT-800 bottom brackets Manufactured in-house by Park Tool, anodized for easy identification and featuring a ratchet/torque wrench-compatible 3/8'' drive Integrated threads for full compatibility with the Park Tool BBT-RS Bottom Bracket Tool Retaining System (sold separately). Fits 16-notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 41-42 mm and a minor diameter (inside of notches) of 39 mm Attributes Bottom Bracket Type 41mm/16 notch