SHIMANO TL-FC33 CRANKSET ADAPTOR TOOLDESIGNED FOR IMPACT WRENCHESThis tool installs the outboard bearing cups used on new (XTR 960, Saint, XT 760, Dura-Ace 7800, etc. ) Shimano Hollowtech II cranksets. It is designed for use with 1/2" socket drives and is made of hardened steel for durability and a precise fit. It is not designed to work with the Dura-Ace BB9000 or the Ultegra BBR60. Features For use with 1/2" socket drives Hardened steel construction for durability and a precise fit Fits most Shimano Hollowtech II 2-piece crankset external bottom bracket cups | Shimano | Tl-Fc33 Crankset Adaptor Tool Installation Tool For Impact Wrench