BBI-TT-BO15 (12-notch, 50.4mm, BBT-47 equivalent on one side, and on the other side, 16-notch, 44mm, BBT-69.4 equivalent) Our BBInfinite Threaded BB Combination Socket's 16-notch side works to install and remove threaded BB's such as Campagnolo, Chris King, FSA MegaExo, Hope, SRAM/Truvativ GXP, Race Face X-type, Surly, Wheels, Fulcrum, and others. This alloy socket is the only tool you need to install or remove BBInfinite T47i, T47E, and T47A modules and the stabilizer rings on all T47 variants we sell. You will not need another tool. This will do it all. Use a standard 3/8" square drive.