Features EXCEPTIONAL DURABILITY Made from diamond materials, these drill bits are extremely durable and can withstand heavy use without losing their sharpness. VERSATILE USE With a wide range of sizes from 0.8mm to 4.0mm, these drill bits are suitable for various materials including metals, agates, gemstones, beads, pendants and pebbles. SUPERIOR PERFORMANCE The diamond tipped design ensures high strength, corrosion resistance and oxidation resistance. These features allow for efficient and precise drilling, improving your overall work performance. Easy to Use The twist drill bit set can be used with drills, making it easy to use even for beginners. In addition, the easy installation and disassembly process ensures more convenience in your drilling tasks. EXTENSIVE SET - The 10 piece set includes a wide range of drill sizes so you have the right tool for every project. This comprehensive set offers versatility and value for money. Functions: Made of diamond materials. High hardness, durable in use. Drill set, high strength, corrosion resistance and oxidation resistance. It is commonly used in metals, agates, gemstones, beads, pendants and pebbles. Drill bit with tip, can be used with the drills, easy to use. Easy installation and disassembly, which can significantly improve your work performance Specification: Diamond Drill Bit Set, Twist Drill, 10pcs/Set Size: 0.8/1.0/1.2/1.5/1.8/2.0/2.5/3.0/3.5/4.0 mmThe length of the twist drills: approx. 75 mm / 3.0 inches approx. 65 mm / 2.6 inches approx. 60.5 mm / 2.4 inches approx. 53 mm / 2.1 inches approx. 46.5 mm / 1.8 inches approx. 43 mm / 1.7 inches approx. 38 mm / 1.5 inches approx. 34 mm / 1.3 inches approx. 30 mm / 1.2 inches approx. 23.9mm/0.9inchUsage range: metal, agate, gemstones, beads, pendants, cobblestones Package includes: 1 x 10pcs Diamond Drill Bit Set Twist Drill Bit Note: different material hardness, the effect is different The colour of the package is random Package List