The Park Tool BBT-9 Bottom Bracket and Crankarm Tool is used to remove and install 16-notch external bearing bottom bracket cups. One end of the BBT-9 securely engages the 16 notches of the bottom bracket cups, while the other end engages the 8 internal splines of the crank arm adjustment cap. This tool also fits Travativ Giga X-Pipes and Howitzer, Race Face X-type, SRAM and FSA Mega EXO bottom bracket cups.