New design features improved spline geometry and 3/8? drive pocket for use with torque wrenches Fits 12-notch X 46mm diameter external bearing bottom bracket cups Designed to stand up to the harsh conditions of professional use Precision laser cut design with ergonomic cushioned grip Fits 12-notch external bearing bottom bracket cups including SRAM DUB, Zipp Vuma, Race Face Cinch, Rotor BSA30, Hawk Racing BB3086, and more