The open bottom bracket wrench is used to remove & install Shimano Hollowtech II, Campagnolo Ultra-Torque & Power Torque, Race Face, FSA, SRAM, Truvativ, Chris King bottom brackets as well as many & others. The 1609/2 wrench also fits on the external centerlock disc nut.
Material: special tool steel, hardened & tempered. Surface finish: chrome plated according to EN12540. Tool also fits the disc brake rotor nuts with 16 external notches.