TR25 - 150 Grit Diamond Bur - 3/32" Shank (Made In USA) - Rounded Taper - Approximately 3mm diameter tip, 5mm diameter base x 9mm head length Rounded Taper - Approximately 3mm diameter tip, 5mm diameter base x 9mm head length 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.