This diamond tipped drill bit set includes 20 pieces with 10 different diameters ranging from 0.8 mm to 4.0 mm, ensuring you have the right size for any project. Perfect for drilling and polishing glass, tile, jewelry, and more. Note: Drill tool not included. Made from premium stainless steel and diamond, these drill bits are finely polished for durability and precision. The diamond tipped drill bit design ensures high temperature resistance and wear resistance, making them ideal for long-term use. These diamond tipped drill bits are perfect for a wide range of materials including jade, metal, , gemstones, , pendants, and cobblestone. Whether you're working on jewelry, crafts, or home improvement projects, these bits meet your needs. Featuring a groove design, these diamond tipped drill bits facilitate debris removal and reduce heat generation during drilling. This design not only enhances drilling efficiency but also ensures a smoother and more precise drilling experience. The set comes in a compact bag measuring 13x9x1.5cm, making it easy to store and transport. Each package includes 20 diamond tipped drill bits, providing you with a comprehensive set for all your drilling and polishing needs. Product name:20Pcs Diamond Tipped Drill Bit Color:Silver Material:Metal Package Contents: 20 * diamond drill bit 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.