Park Tool  BBT-9 Bottom Bracket Tool

The BBT-9 is used to remove and install Shimano® Hollowtech II, Campagnolo Ulta-Torque, and many other external bearing crankset bottom brackets. One end of the BBT-9 securely engages the 16 notches of the bottom bracket cups. The other end of the tool engages the 8 internal splines of the crank arm adjustment cap.
The BBT-9 also fits the rotor disc lockrings using 16 external notches.