Park Tool bottom bracket tools for installation and removal of 16 notch bottom brackets.Fits 16-notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 39-40 mm and a minor diameter (inside of notches) of 37.6 mmFits Shimano XTR BB93, Dura-Ace BB9000, and TokenAlso fits Shimano STEPS square spindle e-bike systems including: E6000, E6002, E6050Replacement for Shimano TL-FC38 toolManufactured in-house by Park Tool, anodized for easy identification and featuring a ratchet/torque wrench-compatible 3/8" drive Park Tool BBT 16 Notch Bottom Bracket Tool Bottom Bracket Tool UPC: 763477001610