30PCS Diamond Shank Grinding Rotary Drill Bits Set Glass Jade Jewelry Engraving Carving Tools

Features: 1. Made of high quality material, high hardness and durability. 2. For the grinding of the mold, the grinding of the inner hole. 3. Fine workmanship and reliable quality. 4. Suitable for electric grinder, engraving machine, electric machinery supporting assembly. 5. Mainly used to engrave glass, jade, repair abrasives and hard objects. Specification: Material: Metal Color: As Pictures Shown Package Size: Approx. 14.5 * 6 * 2cm/5.7 * 2.4 * 0.8in Weight: Approx. 84g Package List: 30 * Grinding Needles