Bestwork 3-Flute Cobalt Drill Bit Set – M35 HSS, Oxynitride Coated, 17-Piece, 1/16"-3/8"

High-Performance Metal Drilling for Hard Materials

Meet the Bestwork 3-Flute Cobalt Drill Bit Set, a durable kit designed to handle challenging metalworking tasks with confidence. This 17-piece collection covers common hole sizes from 1/16" up to 3/8", giving you a versatile toolkit for projects ranging from delicate aluminum work to tougher stainless steel jobs. Crafted with M35 cobalt high-speed steel and a blue oxynitride coating, these bits deliver a balance of hardness, wear resistance, and corrosion protection that can help you maintain sharpness longer between sharpenings.

Design that supports consistent results

• Three-flute geometry promotes smoother chip removal, better heat management, and cleaner hole walls for metalwork that feels precise.
• 135° split point minimizes wandering at contact, enabling faster starts and more accurate drilling in hard metals.
• Three-flats shank locks securely in the chuck, reducing the chance of slippage during cutting.

Comprehensive sizing for real-world projects

• 3-flute sizes: 3/16" x 1, 7/32" x 1, 1/4" x 1, 5/16" x 1, 3/8" x 1.
• 2-flute sizes: 1/16" x 2, 5/64" x 2, 3/32" x 2, 7/64" x 2, 1/8" x 2, 9/64" x 1, 5/32" x 1.

Whether you’re piercing hardened stainless steel, cast iron, or advanced aluminum alloys, the combination of cobalt alloying, oxide coating, and carefully tuned geometry can help you achieve consistent performance while reducing tool wear. The blue oxynitride finish adds a protective layer against corrosion and wear, contributing to a longer usable life in busy shops or DIY workbenches. Use with appropriate cutting speeds and lubrication to maximize results, and expect smoother drilling with less bog-down in tough metals. This set is designed to be versatile, so you can tackle a range of projects without swapping bits mid-task.

What you gain with this set

Designed to support reliability, ease of use, and long-term durability, the Bestwork 3-Flute Cobalt Drill Bit Set offers a practical balance of toughness and precision. It’s not a guarantee of results, but it is a thoughtful option for those seeking consistent hole quality and reduced tool wear across various metalworking tasks.