About This Comprehensive 30-Piece Diamond Drill Bit Set: This Drilax glass drill bit set includes 15 pieces of 2mm and 15 pieces of 3mm diamond drill bits, providing versatile sizes for all your intricate drilling and jewelry making needs in lapidary projects. Universal 1/8" Shank & Dremel Compatible: Each diamond tipped drill bit features a standard 1/8 inch shank, ensuring broad compatibility with most drills, flex shafts, and rotary tools, including full compatibility with Dremel diamond bits and accessories. Premium Triple-Layer Diamond Coating: Crafted from strong alloy steel with a high-quality, triple-layered diamond coating, these stone drill bits offer exceptional durability and provide consistent, clean holes, even in the toughest materials. Ideal for Jewelry & Lapidary Projects: Specifically designed for drilling holes in glass, sea glass, seashells, gemstones, rocks, stones, ceramic, and porcelain. Perfect for creating custom jewelry pieces like necklaces, earrings, pendants, and bracelets. Durable, Reliable & Precision Performance: Built to withstand rigorous use, these diamond drill bits provide consistent performance for precise drilling. Achieve flawless results in your lapidary projects and intricate crafts with ease. Includes Drill Bit Organizer Case: Keep your bits organized and easily accessible with the convenient drill bit organizer case included with your set, ensuring your tools are always tidy and ready for your next project. Pro Drilling Tips for Best Results: For optimal performance and tool longevity, always use water to keep the drilling spot wet, start drilling at an angle before going vertical, and apply minimal pressure to avoid damaging the bit. Overview Material : Alloy Steel Cutting Diameter : 3 Millimeters Finish Type : Nickel Shank Type : Round Brand : DRILAX