9mm M35 Cobalt HSS Drill Bit Kit (10 Pcs) – Heat-Resistant for Drilling Cast Iron & Tough Alloys

When your project demands drilling through tough, unforgiving metals, a standard drill bit simply won’t cut it. Step up your capabilities with this 10-pack of 9mm Cobalt HSS Drill Bits, engineered specifically for professionals and serious DIYers who require uncompromising performance. Forget the frustration of bits that dull quickly or fail under pressure; these tools are designed to deliver clean, precise holes in the most challenging materials.

The secret to their exceptional strength lies in the construction. Each bit is forged from premium M35 High-Speed Steel (HSS) that has been fortified with a 5% cobalt alloy. This isn’t just a surface coating—the cobalt is integral to the steel itself, giving the bit incredible heat resistance and hardness retention. Even at the high temperatures created when drilling through stainless steel, cast iron, or hardened alloys, the cutting edge remains sharp and effective. This robust composition translates directly to a longer tool life, providing superior value and reliability compared to conventional HSS bits.

Precision is paramount in metalwork, which is why each bit features a 135-degree split-point tip. This advanced design allows the bit to bite into the material instantly upon contact, preventing the frustrating “walking” or wandering that can ruin a workpiece. You can start drilling exactly on your mark without needing a center punch, ensuring perfect accuracy from the very beginning. The engineered flute design works efficiently to evacuate chips and debris, minimizing friction and heat for a smoother, faster, and more controlled drilling experience.

This set offers incredible value, providing ten identical 9mm bits to keep your workshop stocked and ready for any task. The precise specifications ensure consistent and reliable performance:

• Diameter: 9mm
• Total Length: 133mm
• Usable Flute Length: 87mm

To keep your investment protected and organized, the entire set comes in a sturdy plastic case. This convenient storage solution prevents damage, keeps your bits easy to find, and is perfect for taking to any job site. For metal fabrication, automotive repair, or any application involving difficult materials, these 9mm cobalt drill bits are the dependable choice for getting the job done right.