Wheels Manufacturing BBTOOL-48-44 Bottom Bracket Socket for 48.5mm and 44mm 16-Notch CupsDouble ended bottom bracket wrench designed to fit 16 notch bearing cups with an outside diameter of 44mm as well as 16 notch bearing cups with an outside diameter of 48. 5mm. Double sided socket tool for installing and removing both 48. 5mm and 44mm 16 notch bottom bracket cups Compatible with all Wheels Manufacturing bottom brackets Socket is machined for 1 2" drive, but a 3 8" to 1 2" adaptor is included so you can use it with 3 8" drive torque