【Diamond Grinding Head Burr】Diamond grinding burrs heads made of diamond particle, extremely sturdy and wear resistance,sturdy enough for fine detail work.Great for polishing stone, glass, ceramics, tile, brick,fiberglass, rock etc. 【Universal Compatiblity Shank】Rotary tool diamond burrs set include 20 Pcs x diamond mounted grinding burrs.Diamond grinder bits set is featured with universal 3mm (1/8 inches) shank grinding drill bits, which compatible with most rotary tools or die grinders. 【Assortment of shapes】 diamond grinding burr bits have 6 different shapes ancludes sphere, cone, cylinder, round head cylinder, bullet, etc, Rich in quantity and various shapes meet your many grinding and carving needs . 20pcs Rotary Tools Accessories packaged in a plastic box, falling resistant and moistureproof easy to store. 【Multi-functional applicability】Stone carving tools great for jewelers, lapidary, engraving enthusiast, stone carver, craft modeling, home repair, precision detail work. Suitable for polishing, grinding, cutting, engraving, carving, touch-up and finishing, dog’s nails work etc. 【Cooling Recommended】 Best used with water cooling to extend bit life and prevent overheating while drilling through hard materials. Head diameter size is10mm / 0.39"; Shank diameter is 3mm / 0.11"; Length: 45mm / 1.77", the heads made of diamond particle with uniform sand, thick and durable, wear resistance, high hardness and impact resistance，which compatible with most rotary tools or die grinders,can be mounted on electronic grinders, gantry grinders and hand drills. Various shapes includes sphere, cone, cylinder, round head cylinder, bullet, different shapes will meet your needs, save-off time and labor. Able to polish, grind, drill, cut, engrave on a wide range of materials including: tile, ceramics, marble, granite and other hard materials.Used for engraving, trimming, precision grinding and internal grinding of carbides in ceramics, glass, precious stones, alloys and many other abrasive materials.