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:- Shimano(R) BB80, BB5700, XT(R) BB70, BB51, and previous external bearing threaded bottom bracket cups- Threaded bottom bracket cups from Campagnolo(R), Chris King(R), FSA(R) MegaExo(R), Hope(TM), SRAM(R)/Truvativ(R) GXP(R), Race Face(R) X-type, Surly(R), Wheels(R), Fulcrum(R), and others- Center lock disc brake rotor lockrings- Bafang BBSH, BBS02 mid-drive motor lockringsTool 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