BW8 - 150 Grit Diamond Bur - 3/32" Shank (Made In USA) - 4.5mm x 13mm Wheel Wheel Shaped Diamond Bur - Approximately 4.5mm x 13mm 150 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 and carvings. The 150 Grit cuts most types of material and reduces chipping and pitting.