ZTTO Bottom Bracket Wrenches Tool for ZTTO BB91/BB109/BB30SH/PF30SH/BB86-30/BB30-30 44mm, 16notch Color: Black / Red Material: Aluminum Alloy This is a good quality tool for installing your bottom bracket cups. It's long enough to give you adequate leverage for installing the cups with the force you need. The precisely shaped metal teeth of the wrench won't damage the teeth on your BB cups. you can use the wrench to remove and install ZTTO BB91/BB109/BB30SH/PF30SH/BB86-30/BB30-30 smoothly.