"Replacement wheel used for splitting the point on HSS and cobalt drill bits when used with XT3000 Tool-Drill Sharpener, Item# 3316900. Splits the point on approx. 5000 bits before needing replacement. Long-lasting, 100-grit wheel does not require dressing. U.S.A. Grit 100, Usage Professional level, Accessory Type Splitting wheel, Product Type Accessory, Wheel Diameter in. 6."