Socket Tool For Shimano(R) and ISIS Drive(R) Splined 20-Tooth BB Cups - Fits all Shimano(R) and ISIS Drive(R) splined 20-tooth bottom bracket cups and other cartridge bottom brackets. - 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 updated Splined Bottom Bracket Socket features a square 3/8" drive. The socket also works with Pedro's snap-channel Pro Socket Handle, 24mm socket or wrench, or in a bench vise. For tough bottom bracket jobs, make sure to check out the BB Socket Holder designed to help hold the Splined Bottom Bracket Socket in place. The 20-tooth pattern fits a variety of cartridge style bottom brackets that feature square taper, Octalink(R), ISIS Drive(TM), and other similar spindles including models from FSA(R), Shimano(R), Truvativ(R), Race Face(R), and others.