<b>Specification:</b><br> Product Name: Diamond Grinding Bit<br> Tip Shape: Cylinder<br> Head Diameter: 10mm/0.39"<br> Shank Diameter: 3mm/0.11"<br> Length: 45mm/1.77"<br> Material: Diamond<br> Weight: 189g<br> <br> <b>Features:</b><br> Diamond coated drill bits help to precisely form, grind and finish.<br> Suitable for enamel glass, ceramics, tiles, bricks, plastics, wood, fiberglass, stone, carbide, metal.<br> Recommended for jewelers, gems, hobbies and crafts, styling.<br> It is better to use water as a lubricant when using.<br> <br> <b>Package Content: </b><br> 20pcs of Diamond Grinding Bit<br>