Features high-quality diamond particles for efficient grinding and drilling through beach sea glass, stone, rock, ceramic, and seashells. steel construction ensures long-lasting performance. 1/8"(3mm)shank compatible with rotary tool 1/8"(3.175mm) collect for drilling, engraving, and deburring in jewelry making, crafts, and DIY projects. Perfect for detailed work on small stones, sea glass, and delicate materials. Great for enlarging holes or creating precise openings in beads and pendants. Works best when used with water (submerged or with a drip) to prevent overheating and extend bit life. Avoid dry drilling for optimal results. Affordable bulk set with a storage case. Replace worn bits easily-ideal for hobbyists and professionals who need reliable, cost-effective grinding tools. Color: Silver Material: Diamond Package Contents: 30 pcs * rotary tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.