Drill bit set GRAPHITE cobalt for metal, cylindrical shank 2.5 mm, 10 pcs

GRAPHITE cobalt drill bit set for metal, cylindrical shank 2.5 mm, 10 pcs is a compact assortment of high-speed drilling tools intended for cutting and creating holes in a variety of metal materials. The set contains ten identical 2.5 mm diameter bits with a cylindrical shank compatible with standard chucks used in handheld drills and drill presses. Cobalt alloy construction increases hardness and red hardness, improving performance when drilling stainless steel, hardened steels and other demanding metalwork where elevated temperature and wear resistance are required.

Advantages

The cobalt composition provides enhanced heat resistance and durability compared with standard HSS bits, prolonging service life under heavy use. A precise tip geometry promotes accurate centring and consistent hole diameter, while the cylindrical shank ensures secure clamping in most drill chucks. The small 2.5 mm diameter is suitable for fine, accurate work and for drilling pilot holes prior to tapping or larger hole operations.

Suitable for

• Drilling stainless steel and hardened steel components
• Maintenance and repair tasks on metal assemblies
• Fabrication of metal parts and prototype work
• Pilot holes for tapping and precision metalworking

Key specifications

• Material: cobalt alloy high-speed steel (HSS-Co)
• Diameter: 2.5 mm
• Shank type: cylindrical
• Quantity in set: 10 pieces
• Intended use: metal drilling, including hardened and stainless steels

How to use

Select an appropriate drilling speed for the material being worked; lower speeds are recommended for stainless and hardened steels to reduce heat build-up. Secure the workpiece and ensure the drill is mounted firmly in the chuck. Use cutting fluid or coolant during drilling to prolong bit life and improve chip evacuation. Apply steady, moderate feed pressure and withdraw periodically to clear chips when drilling deeper holes. Replace worn bits to maintain hole quality and to avoid excessive force on the tool.

Usage recommendations

For best results when drilling hardened or stainless steels, use a lubricant or cutting oil, moderate spindle speeds, and steady feed pressure. Inspect bits before use for wear or damage and replace when the cutting edges become rounded or performance declines.