Sizes: 6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 18 mm, 20 mm, 25 mm Total length: 150 mm; Hex shank diameter: 4.6 to 7 mm (universal 1/4 inch) Quick-change hex shank with groove to reduce slipping and prevent falling Made of high speed steel for durability, polished finish head for durability Key benefits - Versatile size range covers common hole diameters from 6 mm to 25 mm, enabling a single set to handle multiple drilling tasks. - Long reach of 150 mm provides access to deeper holes and thicker workpieces without needing extra extensions. - Universal 1/4 inch hex shank compatibility supports fast, tool-free changes with most quick-change drivers and impact drivers. - Groove in the quick-change hex shank minimizes slipping and helps prevent bit loss during operation for reliable performance. - High speed steel construction with a polished finish head delivers durable, long-lasting drilling capability across materials. Use scenarios - Furniture assembly or cabinetry: drill holes in wood or composite materials across multiple diameters (6–25 mm) with quick bit changes to maintain workflow. - Automotive or metalworking tasks: use the HSS bits for drilling holes in metal panels or brackets, benefiting from durability and long reach. - General workshop or DIY projects: keep this set handy for various drilling tasks that require different hole sizes, using a single tool with a compatible quick-change driver for rapid bit changes.