Grinding wheels are sensitive to vibration due to their mass and speed. The faster your grinder, the more necessary it is to balance wheels. Truly balanced wheels will last longer, put a superior finish on edge tools (and in turn on your projects), reduce the wear on the grinder, and make the grinder run quieter. Easy to setup and use, the Oneway balancing system will quickly and easily allow you to balance your grinding wheels for life.Oneway"s balancing operation compensates for - out of round wheels, non-centered arbor holes, wheel density variation, and side to side thickness variation. Balancing System includes: One right & one left hand balance flange; Balancing base; spacer washers; balancing nuts, washers and screws; and complete instructions. Balances two wheels.