General description Our 20pcs Grinding and Rotary Burr Set is designed for precision work on various hard materials including stone, glass, wood, tile, ceramic, marble, and granite. This multifunctional set features diamond-coated burrs that are ideal for grinding, engraving, cutting, polishing, and carving. Technical specifications Quantity: 20 pieces Shank size: 3mm (1/8 inch) Coating: Diamond Compatibility and accessories Universal fit for most rotary tools and die grinders Other information Exquisite packaging: Neatly packed in a sturdy plastic box for easy storage and transport