- Fits all 16-notch x 44mm external bearing bottom bracket cups and updated design also fits 16-notch x 44mm disc brake lockrings and Shimano TL-FC24 and TL-FC25 adapters. - Updated design features a square 3/8" drive. Also works with Pedro's snap-channel Pro Socket Handle, 24mm socket or wrench, or in a bench vise. - Professional quality, precision sized for the perfect fit. Pedro's socket tools provide the professional quality, precision fit tools required to properly install, remove, and adjust modern drivetrain components. Pedro's designed each socket tool to fit perfectly protecting the component and ensuring simple and safe usage for the mechanic. The new External Bottom Bracket Socket, 16x44 is designed to work seamlessly with Pedro's snap-channel Pro Socket handle, with any 24mm socket/wrench, with any square 3/8" drive, or in a bench vise. Fits 16-notch x 44mm external bearing bottom bracket cups including Shimano BB80, BB5700, XT BB70, BB51, and previous external bearing threaded cups. Also fits many external Threaded types for Campagnolo, Chris King, FSA MegaExo, Hope, SRAM/Truvativ GXP, Race Face X-type, Surly, Wheels, and others. The new design will now also fits disc brake rotor lockrings with 16 external notches and Shimano TL-FC24 and TL-FC25 adapters. Backed by Pedro's lifetime warranty.