Material: Steel<br />Packing: 30PCS/ Set<br /><br />1. 30pcs of Diamond Electroplated Tools suitable for electrical grinding machine， engraving machine， etc<br /><br />2. Used for metal， wood， glass， jewelry， ceramic， stone material and others<br /><br />3. Ideal correcting tool for model processing    <br /><br />30Pcs Diamond Coated Burr Rotary Grinding Head Polishing Nail Surface Grinding Tools (Nail Electric Machine Grinding Accessories)