Perfect for detailed work on small stones, sea glass, and delicate materials. Great for enlarging holes or creating precise openings in beads and pendants. Features high-quality 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. 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., Manufacturer: Ounfhtrttk