Sinyeenglon Hex Shank Cobalt Drill Bit Set – 13Pcs M35 HSS for Metal & Hardened Steel (1/16"-1/4")

Premium cobalt drill bits for hard metals

The Sinyeenglon Hex Shank Cobalt Drill Bit Set brings a high-performance option to metalworking projects. Built with M35 cobalt material, these bits are designed to deliver hardness up to 67 and heat resistance that helps maintain sharpness during tougher drilling tasks. The set includes 13 sizes (1/16" to 1/4" in 1/64" increments) and ships with a convenient index holder, making it easier to grab the right bit on the job. Expect a longer service life compared with standard HSS options, enabling fewer replacements over time.

Why these bits stand out

• Cobalt M35 material: hard, heat resistant, and capable of cutting faster, with life up to 12x longer than the average HSS titanium-coated bit.
• Solid bonding 1/4 hex shank: designed to stay secured in the chuck, helping duties run true and reducing unwanted slippage.
• Shank stability under torque: 5x higher torque resistance reduces radial runout and improves concentricity for cleaner holes.

Versatile metal drilling for hard materials

• Engineered to drill through stainless steel, cast iron, and zinc alloys, expanding your capabilities beyond softer materials.
• Compared to some titanium-plated versions, these cobalt bits are built for harder metals, which may reduce the need for frequent tool changes on demanding tasks.

Size range and organization

The 13-piece set covers common hole sizes from 1/16" up to 1/4". A dedicated index holder helps you keep each bit in its place, so you can quickly locate the right size when speed matters.

Note: while these bits offer strong performance for metal drilling, actual results depend on your material, drill speed, and feed rate. Consider them a robust option for possibilities, not guarantees, in heavy-duty metalworking tasks.