This wrench is used to remove and install Shimano Hollowtech II, Campagnolo Ultra-Torque and Power Torque, Race Face, FSA, SRAM, Truvativ, Chris King bottom brackets as well as many and others. Small wrench is included for removal and installation of Shimano plastic bolts that are used on the Hollowtech II cranksets. The 1609/2BI wrench also fits on the external centerlock disc nut. Material: special tool steel, hardened and tempered. Surface finish: chrome plated according to EN12540. Egonomic heavy duty double component handle.