MULTI-PURPOSE: Diamond grinding head burrs for precision work on stone, glass, wood, tile, ceramic, marble, granite and other hard materials. MULTIFUNCTION: Diamond burrs, 6 different bits for different applications and different needs. Our diamond rotary burr set is highly recommended for grinding, engraving, cutting, polishing, carving and engraving. COMPATIBILITY: Universal 3-shank grinding bits mm (1/8") are suitable for most rotary tools or die grinders. EXQUISITE PACKAGING: 20pcs diamond rotary burrs, premium rotary burr set, neatly packed in a sturdy plastic box, easy to place and carry, well organized to avoid scattering and confusion.