BQLZR Silver 0.3cm Shank 1mm Cylindrial Point Diamond Burr Glass Drill Bits for Engraving Rotary Tools Pack of 30

This diamond burr is highly recommended for crafts, hobbies, home repairs, jewelry, gemstone uses, styling, and more. Shank diameter: 3mm / 1/8"; overall length: 45mm / 1.77", head diameter: 1mm / 0.04". Spherical, diamond-coated head. Can be installed on electric grinders, overhead grinders and hand . Used for engraving, trimming, fine grinding and internal grinding of jade, ceramics, glass, gems, alloys, wood and other hard alloys. If using on glass or mirrors, it is recommended to cool the bit with water.