"Replacement wheel used for splitting the point on HSS and cobalt drill bits when used with XT3000 Tool-Drill Sharpener, Item# 3316900. Sharpens approx. 5000 bits before needing replacement. Long-lasting, 180-grit wheel does not require dressing. U.S.A. Wheel Diameter in. 6, Accessory Type Splitting wheel, Product Type Accessory, Usage Professional level, Grit 180."