WHEEL - 40 Grit Diamond Bur (Made In USA) - 1/8" Shank 10mm Approximate Head Length, 20mm Approximate Head Diameter, 1/8" Shank 40 Grit 100% Natural Diamond (Not Synthetic), U.S. Made - High Quality - Durable Great for grinding or carving all types of stone, glass, tile, wood, and more Great for making marble or other stone sculptures Great for bulk removal and rough cutting.