Wheels Manufacturing Bottom Bracket Socket Tool The Wheels Manufacturing double-sided bottom bracket socket is designed to install or remove external threaded bottom bracket shells with outside diameters of 44mm or 48. 5mm. The socket is machined for 1/2" drive, but a 3/8" to 1/2" adapter is included so you can use it with 3/8" drive torque wrenches. Both sides of the socket have 16 notches and the tool is compatible with all current Wheels Manufacturing bottom brackets with notched cupsalong with many other outboard bearing bottom brackets including Shimano, FSA Mega EXO, Campagnolo Ultra Torque, SRAM/Truvativ andsome FSA Mega EVO. Features Constructed of: Machined 6061 aluminum (red)Fits onto: 44mm and 48. 5mm bottom bracket shells Manufacturer part number: WRENCH-BB48-44Compatible with: All current Wheels Manufacturing bottom brackets with notched cupsalong with many other outboard bearing bottom brackets including Shimano, FSA Mega EXO, Campagnolo Ultra Torque, SRAM/Truvativ and some FSA Mega EVO. | Wheels Manufacturing | Bottom Bracket Socket Tool | Red | 48. 5Mm & 44Mm, 16 Notch, 1/2"&3/8"