This diamond drill bit set includes 20 pieces with 10 different diameters from 0.8mm to 4.0mm, ensuring you have the right size for any project. Ideal for drilling and polishing glass, tiles, jewelry and more. Note: Drilling tools are not included. Made of premium stainless steel and diamond, these drill bits are finely polished for durability and precision. The diamond-coated design ensures high temperature resistance and wear resistance, making them suitable for long-term use. These drill bits are suitable for a wide range of materials including jade, metal, gemstones, pendants and cobblestone. Whether you are working on jewelry, crafts or home improvement projects, these drill bits will meet your needs. With a groove design, these diamond drill bits facilitate debris removal and reduce heat generation during drilling. This design improves drilling efficiency and provides a smoother and more precise drilling experience. The set comes in a compact case measuring 13x9x1.5 cm, making it easy to store and transport. Each package contains 20 diamond drill bits, providing a comprehensive set for various drilling and polishing applications. Product Name: 20pcs Diamond Drill Bits Color: Silver Material: Metal Package Contents: 20 * Diamond Drill Bits Only the above package contents are included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement may vary by +/- 1-3 cm.