Park tool bottom bracket tool bbt49this is a precision cnc machined aluminium tool for the installation and removal of 16 notch external bearing bottom brackets with an outside diameter of 39mm it is anodised for easy identification and features a ratchettorque wrench compatible 38 drive features cnc machined aluminium 39mm od cup fits shimano xtr bb93 dura ace bb9000 tokenbuypark tool workshopfrom chain reaction cycles the worlds largest online bike store