6PCS HSS Drill Bit Set 1/4” Hex Shank Screw Tapping Threading Tools M3 M4 M5 M6 M8 M10 Countersink Drill Bit Metal Drill Bits for Hard Steel for Hard Steel and Alloys

• 1. High-Speed Steel Drill and Tap Construction Crafted from industry-grade HSS with enhanced hardness for cleaner cuts and extended service life, this drill tap set ensures reliable performance when working on hard steel, alloy materials and machining projects.
• 2. Spiral Flute Design for Smooth Threading The twisted spiral structure improves chip removal during tapping, preventing clogging and ensuring clean, consistent thread formation even in deep holes, tight spaces or demanding metalworking applications.
• 3. Universal 1/4" Hex Shank Compatibility Designed with a standard 1/4” hex shank to fit drills, impact drivers and tapping machines, these threading tools provide secure gripping, reduced slippage and stable power transmission during high-torque use.
• 4. Six Metric Sizes for Versatile Threading Tasks This 6-piece set includes M3, M4, M5, M6, M8 and M10 drill taps, offering accurate pitch alignment for both blind and through holes, ideal for fabrication, equipment repair and precision mechanical work.
• 5. Dual-Purpose Drilling and Tapping Efficiency Each bit drills and taps in one continuous step, saving time on automotive repairs, DIY metal projects and workshop tasks, while the black oxide coating improves corrosion resistance and overall durability.

This 6PCS HSS Drill Bit Set combines drilling and tapping functions into one efficient tool system, making it an essential kit for mechanics, fabricators, engineers, DIY users and anyone performing precision metalworking tasks. Designed with high-speed steel for superior hardness and durability, each combination drill tap bit provides strong cutting performance and long-lasting sharpness when used on hard steel, aluminum, brass and various alloy materials. The dual-purpose design allows each bit to drill a pilot hole and create internal threads in a single step, reducing tooling time and improving workflow efficiency. This seamless process eliminates the need for bit changes, making the set especially useful for repetitive tasks, workshop environments and field repairs where speed and convenience are critical. Featuring a spiral flute structure, the bits deliver improved chip evacuation that reduces heat buildup, clogging and friction during tapping. This ensures smoother threading, maintains consistent pitch accuracy and produces clean results even in blind holes or deeper cuts. The optimized chip flow also extends tool lifespan by minimizing wear on the cutting surfaces. With the universal 1/4” hex shank, the bits can be used with a wide variety of drills, including cordless drills, drill presses and tapping machines. The secure hex interface reduces the risk of slippage, ensures stable alignment during high-torque operations and improves handling comfort for both professional and hobbyist users. The set includes six of the most frequently used metric sizes—M3, M4, M5, M6, M8 and M10—giving users a complete threading solution for mechanical maintenance, equipment assembly, automotive repairs and metal fabrication projects. Each bit is engineered with precise pitch standards to ensure compatibility with nuts, bolts and fittings commonly used in manufacturing and repair fields. A durable black oxide anti-rust coating enhances corrosion resistance and protects the cutting edges from moisture, oxidation and high-temperature wear. Whether used in industrial settings, home workshops or mobile repair kits, this drill and tap set delivers consistent performance, strong durability and dependable results across a wide range of materials and applications.