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 -BB52, -MT500, -RS500, etc. ; BBR60: 16 41mm outer diameter cup: suitable for BBR60 (Ultegra 11-speed 6800 series) and MT-800Also 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 SRAM DUB, Cinch, BSA30, Vuma, Hawk 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 compositecolour: blackPackage Contents:2 x Bicycle Bottom Bracket ToolOnly 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.