WHEELS MANUFACTURING F/WIDE(>7mm) BGof2Dropout savers are designed to replace damaged threads in rear derailleur mounts Rather than replacing the dropout at considerable cost & effort, simply follow a few easy steps to repair the existing dropouts Wide Dropout Saver fits dropouts 7mm or more in thickness Narrow Dropout Saver fits dropouts 7mm or less in thickness Contains 2 pieces Starter kit will include: DS 1 (2)pcs, DS 2 (3)pcs, Wheels Mfg. 15 32 drill bit (1)pc.