Constructed from precision-machined 4140 steel, the BBT-169 is a heavy duty tool for the removal and installation of select components with 16-notch tool fittings, including bottom brackets, center lock disc brakes, and e-bike motor lockrings. The BBT-169 is designed to be compatible with any bottom bracket with the corresponding tool fitting, with an extra-deep body to accommodate extra-wide spindles and low-profile walls at the point of engagement for recessed lockrings. The BBT-169 has three methods of tool engagement-a 3/8" drive fitting, a 1" hex fitting, and 36 mm wrench flats-allowing you to take on even the most seized bottom bracket cups. For added stability, the BBT-169 features integrated threads for use with the Park Tool BBT-RS Bottom Bracket Tool Retaining System or GPS-1 Guide Pins (each sold separately). Fits 16-notch tool fittings with a major diameter (outside of notches) of 44-45 mm and a minor diameter (inside of notches) of 42.7 mm, including: ShimanoA(R) BB80, BB5700, XTA(R) BB70, BB51, and previous external bearing threaded bottom bracket cups Threaded bottom bracket cups from CampagnoloA(R), Chris KingA(R), FSAA(R) MegaExoA(R), Hope(TM), SRAMA(R)/TruvativA(R) GXPA(R), Race FaceA(R) X-type, SurlyA(R), WheelsA(R), FulcrumA(R), and others Center lock disc brake rotor lockrings Bafang BBSH, BBS02 mid-drive motor lockrings Tool specifications: 3/8" drive fitting 1" and 36 mm wrench flats 50.04 mm (1.97") outer diameter at point of engagement Internal clearance: 42 mm (1.654") depth (from tool face) x 30.44 mm (1.198") diameter Not rated for use with impact drivers