11mm High-Speed Cobalt Steel Drill Bits – Precision Metal Cutting Set of 10

The 11mm High-Speed Cobalt Steel Drill Bits are built for demanding metal drilling applications where precision, speed, and durability matter most. Each bit is made from premium cobalt-alloyed high-speed steel (HSS-Co), offering exceptional heat resistance and long tool life even under continuous heavy-duty use. Designed for professional machinists, fabricators, and serious DIY users, these drill bits deliver superior cutting performance through stainless steel, cast iron, alloyed steel, and other hard metals that ordinary HSS bits struggle to penetrate.

With a precise 11mm diameter, each bit is manufactured to exact tolerances to ensure clean, accurate holes with minimal burrs. The total length of 133mm and usable cutting length of 87mm provide the perfect balance between reach and stability, allowing you to drill deeper while maintaining steady control and reduced vibration. Their high-speed steel core is enriched with cobalt, which increases red hardness — meaning the bits retain their sharpness and strength even when exposed to high drilling temperatures.

The bits feature a precision-ground cutting edge that reduces friction and requires less feed pressure, resulting in smoother, faster drilling. The spiral flute design helps clear chips efficiently, preventing clogging and overheating. Whether you’re drilling on a press, hand drill, or industrial rig, you’ll notice consistent chip evacuation and stable feed rates across multiple materials.

Each set includes 10 pieces, conveniently stored in a durable plastic box for easy organization and transport. The storage case keeps the bits protected from dust, moisture, and accidental dulling, ensuring they’re ready whenever you need them. This thoughtful packaging makes it ideal for both on-site professionals and workshop storage.

Engineered for versatility, these cobalt drill bits excel in:

• Stainless steel fabrication
• Automotive and mechanical repairs
• Electrical and HVAC installations
• Metal furniture and frame assembly
• Precision engineering and maintenance tasks

Whether you’re cutting through thick steel plates or thin-walled tubing, these bits maintain sharpness and edge integrity over repeated use. Their high cobalt content gives them a distinctive golden finish and exceptional resistance to wear, reducing the need for frequent replacements.

This 11mm cobalt HSS drill bit set combines craftsmanship, industrial reliability, and long-term performance. It represents an essential addition to any metalworker’s toolkit — dependable, efficient, and designed for professionals who value accuracy and endurance.