Precision machined ultra-light fiber composite with high durability. This material causes less damage to the bottom bracket than other common steel and aluminum materials. 5 in 1. Bottom bracket for installing and disassembling Hollowtech: 16-slot 44mm outside diameter cup: suitable for SM-BB52, -MT500, -RS500, etc. ; BBR60: 16 41mm outer diameter cup: suitable for BBR60 (Ultegra 11-speed 6800 series) and MT-800 Also compatible with FSA386: 16 49mm outer diameter cup: suitable for MegaEvo, etc. ; BB9100: 16 39mm outer diameter cups: suitable for -R9100, XTR BB93, - BB9000, TokenDUB16T: 12-slot 46mm outer diameter cups: suitable for DUB, Cinch, Rotor BSA30, Vuma, Hawk Racing BB3086, etc. Tip: High-performance engineering steel plastics are used, and if the tool is slightly worn, it will not affect multiple uses. Hollowtech: 16 Teeth 44mm OD Cup, Fits: Fits many external thread types. Material: fiber composite colour: black Package Contents: 2 x Bicycle Bottom Bracket Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.