This 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. Featuring a groove design, these 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. These 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. Made from premium stainless steel and , these drill bits are finely polished for durability and . The tipped drill bit design ensures high temperature resistance and wear resistance, making them ideal for long-term use. The set comes in a compact bag measuring 13x9x1.5cm, making it easy to store and transport. Each package includes 20 tipped drill bits, providing you with a comprehensive set for all your drilling and polishing needs., Manufacturer: Asyduey