Wolf Tooth Components Bottom Bracket Tool Compatible with the following external cup bottom brackets (16 notch, 44 mm): most Shimano, SRAMruvativ GXP, Chris King, FSA EXO, Race Face, Hope, Campy, Surly, etc. Does NOT fit the following: XTR BB93, Dura Ace BB9000, Ultegra 6800 11-speed This External Bottom Bracket cup installation tool features large finger notches to start installation by hand and a 3/8" square socket to finish the job with a ratchet or torque wrench Designed for the mechanic on the go or the home mechanic with limited space, the Ultralight tools are a solid choice for a multitude of projects - from centerlock rotor installs, bottom brac