Fits all Shimano and ISIS Drive splined 20-tooth bottom bracket cups and other cartridge bottom bracketsUpdated 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 viseProfessional quality, precision sized for the perfect fitBottom Bracket SocketShi/ISISUPC/EAN/GTIN: 790983298050