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• 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 S himano® 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 Show more