Drill bit set GRAPHITE cobalt metal cylindrical 3.2 mm 10 pcs

GRAPHITE cobalt metal drill bit set contains ten cylindrical 3.2 mm bits designed specifically for drilling and enlarging holes in steel and other ferrous materials. The bits are produced from cobalt-alloy high-speed steel to provide improved hardness and hot hardness compared with standard HSS, enabling more consistent cutting performance under higher temperatures and heavier loads. The set is suitable for use in hand-held drills and drill presses and is intended for metalworking, maintenance and repair operations where increased wear and heat resistance is required.

Advantages

The cobalt-alloy construction increases red-hardness and wear resistance, extending bit life when working with hardened or abrasive steels. The cylindrical shank allows secure clamping in standard drill chucks and minimizes slippage during operation. The 3.2 mm diameter provides a balance between precision and drilling speed for common metalworking tasks. The set of ten identical bits ensures ready replacement on the job and reduces downtime due to dulling or breakage.

Suitable for

• Drilling holes in steel plates, profiles and ferrous components
• Repair and maintenance tasks on machinery and equipment
• Workshop and production drilling where small-diameter holes are required
• Use in hand drills and bench drill presses

Key specifications

• Drill type: twist drill bits for metal
• Material: cobalt-alloy high-speed steel
• Diameter: 3.2 mm
• Shank type: cylindrical (straight) shank compatible with standard chucks
• Quantity: 10 pieces
• Intended use: drilling and enlarging holes in ferrous metals

How to use

Secure the appropriate 3.2 mm bit in the drill chuck, ensuring the shank is clamped firmly and concentrically. Select a suitable cutting speed and feed for the workpiece material; for steel and ferrous alloys, use moderate speeds to reduce overheating. Apply cutting fluid or coolant when drilling to improve chip evacuation and reduce thermal stress on the bit. Progress with steady, even pressure and clear chips from the hole periodically to avoid clogging. After use, clean the bits and store them dry to prevent corrosion.

Usage recommendations

For best results when drilling hardened or thick steel, use cutting fluid, moderate drilling speeds and incremental pecking to aid chip removal. Replace bits from the set when signs of wear, chipping or reduced cutting performance appear to maintain hole quality and reduce risk of breakage.