5.5mm Cobalt HSS Drill Bit – High-Speed, Precision Metal Drilling, 10-Piece Set

The 5.5mm Cobalt HSS Drill Bit – High-Speed, Precision Metal Drilling, 10-Piece Set is engineered for craftsmen, technicians, and industrial users who demand durability, accuracy, and consistent performance. Each drill bit in this set is crafted from premium Cobalt High-Speed Steel (HSS), designed to deliver superior cutting strength and heat resistance, even under continuous heavy-duty use.

Built for precision, the 5.5mm diameter offers clean and accurate holes through a variety of tough materials including stainless steel, cast iron, alloyed steel, and other hard metals. The addition of cobalt in the alloy enhances the bit’s ability to withstand high temperatures, ensuring it maintains sharpness and structural integrity during prolonged drilling sessions. Whether you’re working on fabrication projects, automotive repairs, or professional machining tasks, this drill bit provides a smooth drilling experience with minimal friction and wear.

Each bit measures 75mm in total length with a usable cutting length of 43mm, providing an optimal balance between strength and reach. The spiral flute design aids in efficient chip removal, reducing clogging and improving drilling efficiency, while maintaining a steady cutting speed throughout the process. The split point tip starts drilling on contact, eliminating the need for pilot holes and preventing bit walking on metal surfaces. This results in cleaner entry points and faster hole completion, saving both time and effort on every project.

The set comes with 10 pieces neatly packed in a durable plastic storage box, keeping each drill bit organized, protected, and easy to access. This compact packaging also makes it convenient to carry in toolboxes or store on workbenches without taking up unnecessary space. The transparent case allows for quick identification of bit sizes and easy replacement during job site work.

Key advantages:

• Made from cobalt-enriched High-Speed Steel for superior hardness and heat resistance
• 5.5mm diameter ideal for metal, stainless steel, and hard surface drilling
• Total length of 75mm with 43mm usable section for deep, precise drilling
• Split point tip for accurate starts and reduced bit wandering
• Efficient chip removal design to maintain drilling speed and bit life
• Supplied in a sturdy plastic storage box for protection and easy transport
• Includes 10 precision-ground drill bits per pack

This professional-grade cobalt drill bit set is built to withstand high workloads and maintain exceptional performance even under continuous use. It’s an excellent choice for workshops, manufacturing environments, maintenance crews, and DIY enthusiasts who value precision and reliability. Every bit represents the balance between engineering excellence and practical usability, delivering dependable results with every cut.