The Park Tool BBT-59.2 removes and installs 16 notch external bearing bottom bracket cups with a 41mm outside diameter. Featuring a 3/8ths inch drive for easy use with ratcheting handles and torque wrenches. Made with precision CNC machined aluminum for an optimized fit and anodized and laser engraved for easy identification. Fits these and other
16 notch 41mm bottom bracket cups.