Drill Hulk 1/4-Inch Cobalt Steel M35 Jobber Length Twist Drill Bits for Hard Metal, Stainless Steel – Pack of 12

Overview

Drill Hulk 1/4-Inch cobalt bits are built from a durable blend of high-speed steel with 5% cobalt (M35). This combination delivers improved red hardness and steadier performance when drilling through hard metals, including stainless steel. The result is a tool that feels robust in the hand and ready for demanding tasks without compromising control.

In practical use, these bits are designed for metalworking projects where high strength materials are involved. The feel of a solid, well-balanced bit translates into smoother starts, more confident feeds, and precise holes even in challenging workpieces.

Key specifications

• Cutting diameter: 1/4 inch
• Flute length: 2-3/4 inch
• Overall length: 4 inch
• Tip design: 135-degree split point for self-centering starts
• Shank: 3-flat for improved bite and chuck grip

Durability and edge retention

The cobalt content helps maintain edge integrity under heat, while the uniform hardness supports repeated sharpening. This makes the bits a practical choice for users who value long-term performance and cost efficiency in metaldrilling tasks.

Best uses and materials

These bits excel on hard metals, with stainless steel as a primary target. They’re well-suited for drilling through alloy steels, hard coatings, and other demanding materials where standard high-speed steel bits may struggle to hold a clean edge.

What’s included

Pack contains 12 pieces of 1/4-inch cobalt drill bits with a protective case for organized storage and transport.

Real-world scenarios

• Fabrication shop drilling mounting holes in stainless steel brackets without frequent bit changes
• DIY projects on alloy steel components such as frames, housings, and brackets
• Prototype work in metalworking labs where consistent hole quality matters

Care and maintenance

Keep cutting edges cool with light lubrication, maintain steady feed pressure, and wipe bits after use to reduce corrosion. When edges wear, the material’s hardness supports re-sharpening before replacement.

Bottom line

Drill Hulk’s 1/4-Inch cobalt bits combine heat resistance, sharpenability, and compatibility with hard metals. They offer a dependable option for professionals and serious hobbyists working with stainless steel and other tough materials.