Enhance your woodworking and metalworking projects with this premium 4-piece HSS drill bit set, expertly designed for precision drilling and countersinking. Crafted from high-speed steel (HSS 4241), these drill bits are engineered to efficiently drill holes and countersink screw sizes #6, #8, #10, and #12 in materials with hardness below 25HRC, including carbon steel, sheet iron plates, insulating plates, PVC plates, and wood boards. Key Features: · High-Speed Steel Construction: Made from durable HSS 4241 material, these drill bits offer excellent hardness and wear resistance for long-lasting performance. · Versatile 4-Piece Set: Includes drill bits sized #6 (2.38mm), #8 (2.78mm), #10 (3.175mm), and #12 (3.56mm), suitable for a wide range of screw sizes and applications. · Special Steel Counter Sleeve: Designed to countersink or counterbore holes, allowing you to drill and countersink wood screws without the need to change bits, improving efficiency. · Adjustable Counter Sleeve Depth: Easily customize the countersink depth with the included hex wrench, providing precise control for various screw lengths. · Fast-Change 6.35mm Hex Shank: Standard 1/4" hex shank ensures quick and secure bit changes, compatible with most drill machines featuring a chuck or connector. · Adjustable Drilling Length: Simply loosen or tighten the setscrew to adjust drilling depth, accommodating screws of different lengths for versatile use. · Wide Material Compatibility: Ideal for drilling workpieces such as carbon steel, sheet iron plates, insulating plates, PVC plates, and wood boards with hardness below 25HRC. Specifications: · Material: HSS 4241 · Drill Sizes: #6 (2.38mm), #8 (2.78mm), #10 (3.175mm), #12 (3.56mm) · Hex Shank Diameter: 6.35mm (1/4") · Condition: 100% Brand New Package Includes: · 4 x HSS Drill Bits (#6, #8, #10, #12) · 1 x Hex Wrench This versatile drill bit set offers precise drilling and countersinking capabilities, making it an essential addition to your toolkit for woodworking, metalworking, and general DIY projects. Its adjustable features and durable construction ensure efficient, clean, and accurate results every time.