Bottom Bracket Tool — 16-Notch A precision CNC-machined aluminum tool designed for the installation and removal of select threaded bottom brackets with 16-notch tool fittings. Built for durability and ease of use, this tool ensures a secure and precise fit for professional and home mechanics alike. Features: Compatible with select bottom brackets, including: Shimano® Ultegra® BBR60 Shimano® Deore XT® MT-800 High-precision CNC machining for an exact fit and long-lasting durability Anodized finish for easy identification 3/8'' drive compatibility, allowing use with a ratchet or torque wrench 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: Major diameter (outside of notches): 41-42 mm Minor diameter (inside of notches): 39 mm Attributes: Bottom Bracket Type: 41mm / 16-notch A must-have tool for precise and efficient bottom bracket maintenance and installation