This 30 pcs electric polishing kits are for DIY polished carving, etching, grinding, sanding. This diamond burr set is designed to be used with high speed rotary tools,grinders and drills for electric grinding accessories. Features: Our electric polishing kits has 30 assorted diamond burrs in a storage box for different needs. Suitable for processing wood, glass, plastic, metal, stone, tile, ceramics and more. High working efficiency, perfect grinding effect and long using life. Basically replace with handle small grinding wheel, and no dust pollution. Convenient to grind, simple to use, safe and reliable. Specifications: Color: Silver Material: Electroplated Diamond Shank Diameter: 3mm / 0.12in Overall Length: 45mm / 1.8in Item Weight: Approx. 62.7g / 2.2oz 30pcs) Package Size: Approx. 14.4 * 6 * 2cm / 5.7 * 2.4 * 0.8in Package Weight: Approx. 102.6g / 3.6oz Package List: 30 * Electroplated Diamond Burrs Bur Bit