For installing and removing 48.5 mm and 44 mm, 16-notch bottom bracket cups Compatible with all Wheels Manufacturing bottom brackets Machined for 1/2'' drive, but a 3/8'' to 1/2'' adapter is included 48 mm side fits some FSA MegaEVO bottom brackets 44 mm side fits some including Shimano, FSA MegaEXO, Campy Ultra Torque Machined 6061 Aluminum Anodized red