Hymnorq M35 Cobalt Step Drill Bit Metric 3mm-14mm, HSS-Co 5% Cobalt Spiral Flute Cone Drill for Stainless Steel, Hard Metal, Cast Iron & Plastic, 1/4" Hex Shank, 12 Steps

Product Details

• TRUE M35 COBALT HSS – Manufactured from industrial-grade High-Speed Steel with 5% Cobalt (M35 Grade). Harder and more heat-resistant than standard HSS4241 or HSS6542 bits. It is specifically engineered to cut through hard metals like 304 stainless steel, cast iron, and high-carbon steel without dulling quickly.
• 12-IN-1 METRIC SIZES – Why carry a heavy box of bits? This single bit covers 12 metric sizes: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14mm. The step height is 5mm, perfect for drilling or enlarging holes in sheet metal up to 5mm thick. Laser-etched markings make size identification easy.
• DUAL SPIRAL FLUTE & HEX SHANK – The 2-flute spiral design clears chips faster and allows particles to escape easily, reducing heat buildup and friction. The 1/4-inch hex shank ensures a secure, non-slip fit in standard power drills, impact drivers, and bench drills, providing greater torque transmission than round shanks.
• UNBEATABLE ON STAINLESS STEEL – Unlike standard bits that fail on hard materials, this M35 bit excels on 304 Stainless Steel. Usage Guide: For stainless steel up to 1mm thick, a hand drill is sufficient; for 2-3mm thickness, a bench drill is required for stability and safety. Also cuts wood, plastic, and aluminum effortlessly. (NOTE: Not for glass, tile, or concrete walls).
• EXTEND BIT LIFE – Crucial Tip: Cobalt is hard but brittle. To prevent burning or snapping, continuous cooling (using cutting oil or water) is MANDATORY during operation. Keep the drill vertical and use low RPMs for harder metals to ensure the longevity of the cutting edge.