Stone Carving Set Diamond Burr Bits,20PCS Polishing Kits Rotary Tools Accessories with 1/8" Shank For Carving Great for cutting gemstones, glass, porcelain, tile, carbide, rock, ceramic, aluminum and copper, great for crafts, hobbies, home repairs, jewelry, gem use, modeling, and more. The diamond grinding head set features a general 3 mm (1/8 in.) grinding head that is compatible with most rotary tool or die grinders. Rotary tool diamond burrs set, Diameter: 0.118 inch (3mm) Colour: picture color Material: diamond Package Contents: 20 * Diamond mounted grinding burr Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.