General description These Extended Twist Drill Bits are designed for high performance and versatility, making them ideal for various DIY projects and construction applications. The set includes 8 different sizes, allowing you to drill holes of varying diameters with ease. Made from high-speed steel (HSS 4241), these bits are known for their durability and precision. Technical specifications Material: High Speed Steel (HSS 4241) Diameter options: 4mm, 4.2mm, 4.5mm, 5mm, 5.2mm, 6mm, 8mm, 10mm Length: 200mm Quantity: 8 pieces Usage Suitable for drilling into various materials including steel castings, spring steel, white steel, ordinary steel, angle iron, aluminum, copper, wood, and stainless steel. Ideal for DIY projects, processes, and general construction engineering applications.