Compatible with Shimano Hollowtech II as well as Campagnolo Ultra-Torque and Power Torque, Race Face, FSA, Sram and many other 16 notch/44mm bottom bracketsOne end of the BBT-9 securely engages the 16 notches of bottom bracket cups - the other end of the tool engages the 8 internal splines of the crank arm adjustment cap on Shimano® Hollowtech II® systemsThe BBT-9 fits cups and lockrings with 16 external notches and an outside diameter of approximately 44mmBottom Bracket WrenchHollowtech IIBBT-9UPC/EAN/GTIN: 763477000491