1.8 x 12.0mm Cone 320 Grit Grit Diamond Bur - 3/32 inch shank 1.8mm Diameter by 12.0mm long Cone Shaped Diamond Bur 320 Grit 3/32 inch shank Recommended Speed: 20,000-35,000 RPM Resistant to: acid, alkali and heat Manufacturer specializes in products for the manicure and nail industries High quality burs for a wide variety of applications