The park tool bbt9 bottom bracket and crank arm tool has been designed to remove and install shimano hollowtech ii bottom brackets the highly durable park bbt9 has been fully specced to offer high performance with its well made design and innovative features that make it incredibly easy to use this park tool bike tool has a plastic coated handle which delivers a secure and comfortable grip 16 laser cut splines securely engage the notches of the bottom bracket cups while the other end fits the