MaterialsThe twist drill bits are made of high speed steel for high hardness and durability. Using high-speed steel drill materials to improve machining efficiency and convenience. SizeThis set contains 8 drill bits of different sizes and the most popular drill bits, including 4mm, 4.2mm, 4.5mm, 5mm, 5.2mm, 6mm, 8mm, 10mm drill bits. DesignExtra long cutting edge allows you to drill deep holes with these bits. Sharp head design provides center point, high maneuverability, faster with less effort. UsageThey are ideal for most drilling materials and soft materials. Suitable for most drilling jobs and materials such as thin metal, aluminum, iron, carbon steel, wood, plastics, etc. AdvantageThe drill bits pointed twist drills make drilling easier and more effortless. Sharp twist drill bits will make drilling easier and easier. The long cutting edge allows you to use these bits for drilling deep holes. Product Features: Twist bits are made of high speed steel for high hardness and durability. This set contains 8 drill bits of different sizes and the most popular drill bits. The extra-long cutting edge allows you to drill deep holes with these bits. They are ideal for most drilling materials and soft materials like aluminum, wood and plastics. Sharp twist drill bits make drilling easier easy and more effortless. Features: Material: high speed steel Type: twist drill Diameter: 4mm, 4.2mm, 4.5mm, 5mm, 5.2mm, 6mm, 8mm, 10mm Length: approx. 200mm Package Contents: 8 x drills