RCINDUS 10Pcs 5/16-Inch Cobalt Drill Bits | HSS M35 for Metal and Wood

RCINDUS 10Pcs 5/16 Inch Cobalt Drill Bit Set

Engineered for demanding metalworking tasks, the RCINDUS 10-piece set uses M35 cobalt high-speed steel to deliver a resilient, high-performance drilling experience across metals and other tough materials. The 5% cobalt composition provides improved hardness and edge retention compared with standard HSS, helping to tackle hard metals with steadier starts and cleaner holes.

Precision you can feel

The bits feature a 135-degree split-point that centers the cutting edge before the bit begins to cut, reducing wandering on tough surfaces and enabling more predictable starts. The result is a smoother entry, less skidding, and more consistent hole placement.

What you get in the box

• A pack containing 10 pieces, each 5/16 inch (7.938 mm) in diameter, stored in a plastic case for easy organization.
• High quality HSS M35 cobalt alloy with 5% cobalt content, designed for higher hardness and wear resistance.
• Precise manufacturing with diameter control within -0.03 mm for dependable sizing.

Materials and applications

These bits are built to perform across a range of materials, including hardened metal, stainless steel, cast iron, as well as plastics and PVC boards, and even wood in some tasks. The combination of robust cobalt alloy and flexible HSS design makes them suitable for various DIY projects and professional tasks.

• Hardened metal and stainless steel
• Cast iron and hard plastics
• PVC boards and wood
• DIY projects, automotive parts, and metalwork tasks

Quality you can trust

RCINDUS controls quality through direct factory production. Real M35 material undergoes more than a dozen processes, including full grinding and hardening, to guarantee tight tolerances. Diameter accuracy is kept within -0.03 mm, helping ensure consistent hole sizes across the batch.

While results depend on technique, tool fit, and material, this set is designed to support reliable starts, better centering, and durable performance in challenging projects. It’s a practical choice for shop setups, makerspaces, or DIY enthusiasts who want a versatile cobalt drill bit set without compromising on precision or organization.