Drill bit set IRWIN 19 pcs HSS-CO 01-2569 — high-speed cobalt bits for metal

IRWIN metal drill bit set 19 pcs HSS-CO 01-2569 provides a complete assortment of cobalt high-speed steel bits engineered for drilling into metal and hard alloys. The set includes a range of commonly used diameters to cover general metalworking, maintenance and fabrication tasks. Designed for both hand-held drills and machine-mounted drilling, these HSS-CO bits offer improved wear resistance and higher heat tolerance compared with standard HSS drills, helping to maintain cutting performance when working with stainless steel, cast iron and other tough materials.

Advantages

The cobalt HSS-CO construction increases hardness and hot hardness, allowing the bits to retain a sharp cutting edge at higher temperatures and under heavier loads. Precision-ground flutes promote efficient chip evacuation and consistent hole quality, while a multi-diameter range in one compact set reduces the need to purchase individual drills. The bits are compatible with standard chuck systems and are suitable for both manual and machine use.

Suitable for

• Drilling stainless steel and alloy steels
• General maintenance and repair work on metal components
• Fabrication tasks involving sheet metal and thicker metal parts
• Machine-shop and workshop drilling operations
• On-site hand-held drilling where increased heat resistance is required

Key specifications

• Material: high-speed steel with cobalt alloy (HSS-CO)
• Number of pieces: 19
• Intended use: drilling metal and hard alloys
• Compatibility: suitable for hand-held drills and drill presses with standard chucks
• Flute type: precision-ground for chip evacuation

How to use

Select the drill diameter appropriate for the hole size required and secure the bit in the drill chuck. Use a steady feed and appropriate rotational speed for the material being drilled; lower speeds are recommended for harder alloys to reduce heat buildup. Apply cutting fluid or coolant for improved lubrication and longer bit life when drilling stainless steel or other heat-sensitive materials. After drilling, clear chips from the flutes and inspect the cutting edge for wear before further use.

Usage recommendations

For best results, start with a small pilot hole when drilling large diameters, maintain firm but controlled pressure, and use suitable cutting fluid. Replace bits at the first signs of dulling to avoid increased heat and potential workpiece damage.