Pedro's External Bottom Bracket Socket Tool Doing your own bike maintenance, repairs and installations can save you a lot of money and Pedro's has all the tools you will need to get it done right. Pedro's External Bottom Bracket Socket Tool works with any 24mm socket/wrench, with any square 3/8 drive, or in a bench vise and is required to install, remove and adjust any modern drivetrain components. This bottom bracket tool Fits 16-notch x 44mm external bearing bottom bracket cups including Shimano(R) BB80, BB5700, XT BB70, BB51, and previous external bearing threaded cups. Features 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(R) TL-FC24 and TL-FC25 adapters. Square 3/8 drive works with Pedro's snap-channel Pro Socket Handle, 24mm socket or wrench, or in a bench vise. | Pedro's | External Bottom Bracket Socket Tool 16-Notch External Bearing Bb