Diamond Grinder Bit 1/8" Shank Compatible with Dremel Rotary Tool Attachment Accessories Grinding Burrs for Stone Glass Resin Porcelain Ceramic Quartz Glaze Steel Carve Engrave Polish Made in China. diamond coated grinding bits, 3mm shank compatible with Dremel 1/8"(3.175mm)collect, 10 types of head shapes, head dia 6mm, total length 45mm, one 20-pocket blue plastic tool bag with hook and one clear plastic box with hook. Work great for a variety of uses, grinding engraving trimming porting polishing carving deburring cutting drilling sculpting milling sanding elongating enlarging stone stained glass headstone glass porcelain ceramic metal steel glaze wood quartz agate moonstone crystal riverstone flagstone soft apatite mosaic slate resin hard rock jewelery jade amethyst marble granite. These diamond grinding burr bits can remove pits of auto rust to bare metal, grinding broken screws, grinding pet's hard nail. Premium diamond grains coating, durable, well-balanced, sharp, aggressive. 5 years returnless replacement.