Professional 3.0mm Cobalt HSS Twist Drill Set – Long-Life Bits for Steel, Alloy & Iron

The Professional 3.0mm Cobalt HSS Twist Drill Set is designed for precision, endurance, and performance across the toughest drilling applications. Engineered from premium cobalt high-speed steel, each bit offers exceptional hardness and heat resistance, ensuring long service life even under intense workloads. This makes it a reliable companion for professionals and DIY enthusiasts who demand consistent accuracy when working with metal, steel, and other dense materials.

Each drill bit in the set features a 3.0mm diameter, a total length of 75mm, and a usable length of 43mm, making it ideal for both shallow and medium-depth drilling. The bits are crafted with a balanced twist design that promotes efficient chip removal while maintaining excellent stability during operation. This reduces friction and prevents overheating, allowing for smoother, faster drilling with cleaner results.

The cobalt-enriched HSS composition enhances the bits’ strength and temperature tolerance, meaning they can maintain sharpness and cutting power longer than standard HSS bits. Even when drilling through stainless steel, cast iron, or high-tensile alloys, these bits resist wear and maintain their precision edge. The design minimizes breakage and wobbling, ensuring each hole is cleanly cut with minimal effort.

These 3.0mm cobalt HSS bits are especially suited for metalworking, fabrication, automotive repairs, and general industrial use. Whether used in bench drills, hand drills, or power drill presses, they deliver stable and reliable performance. The optimized 135° split-point tip allows for fast starts and reduces the need for excessive pressure or pilot holes, saving time and extending tool life.

Each set comes with ten identical 3mm bits, conveniently packed in a durable plastic case for organization and portability. The compact, transparent storage box keeps your bits protected from dust, moisture, and accidental damage while making it easy to identify and access the right size when needed.

Key advantages include:
• Long-lasting cobalt alloy construction for extended durability
• Precision-ground edges for smooth, efficient cutting
• 135° split-point design for accurate starts and reduced walking
• Excellent performance on stainless steel, alloy steel, and cast iron
• Suitable for high-speed and heavy-duty drilling tasks
• Organized in a practical plastic case for safe storage and transport

With their combination of advanced metallurgy, precision engineering, and thoughtful design, these cobalt HSS twist drills deliver unmatched reliability for users who value quality tools. They maintain cutting efficiency even after prolonged use and remain stable under continuous high-speed conditions. The result is a professional-grade drilling experience marked by control, consistency, and precision.