General description Our Drill Bit Set features 200mm extra long drill bits made from high-quality HSS 4241 high-speed steel. This set includes 8 different diameters: 4mm, 4.2mm, 4.5mm, 5mm, 5.2mm, 6mm, 8mm, and 10mm, designed to meet various drilling needs. The twisted spiral design allows for easy removal of sawdust and iron filings, ensuring efficient work. Technical specifications Material: High Speed Steel Length: 200mm Diameters: 4mm, 4.2mm, 4.5mm, 5mm, 5.2mm, 6mm, 8mm, 10mm Quality: 8 pieces Compatibility and accessories Suitable for drilling various materials including steel castings, spring steel, white steel, I-beam, carbon steel, angle iron, aluminum, copper, wood, and stainless steel. Usage Ideal for DIY projects, processing, and general construction engineering applications. Take protective measures during use to prevent drill breakage due to elongation and high hardness. Other information Package includes 8 x Twist Drill Bits.