GRAPHITE cobalt metal drill bit set 10.5 mm cylindrical shank 5 pcs (57H056-5)

GRAPHITE cobalt metal drill bit set 10.5 mm with cylindrical shanks, 5 pieces, is designed for drilling hard and heat-resistant metals. The set includes five identical 10.5 mm diameter bits made from high-cobalt steel alloy to improve wear resistance and cutting life when working with ferrous materials. Each bit has a cylindrical shank suitable for use in hand-held drills, drill presses and other machine chucks that accept straight shanks.

Advantages

The cobalt composition increases heat resistance and reduces edge wear during high-speed drilling in hardened steels and other tough materials. Cylindrical shanks provide stable grip in standard chucks, while the consistent 10.5 mm diameter across all five bits ensures repeatable hole sizes for production or workshop tasks. The pack of five spare bits supports uninterrupted work and quick replacement when a cutting edge becomes dull.

Suitable for

• Drilling holes in hardened and high-strength steels
• Workshop and industrial metalworking operations
• Use with hand-held electric drills and stationary drill presses
• Maintenance, repair and fabrication tasks on ferrous materials

Key specifications

• Drill diameter: 10.5 mm
• Quantity in set: 5 pieces
• Material: cobalt alloy high-speed steel
• Shank type: cylindrical (straight) shank
• Intended material: steel and other ferrous metals

How to use

Secure the appropriate drill bit in the drill chuck and tighten firmly to prevent slipping. Select a drilling speed and feed rate suitable for cobalt bits and the specific steel grade being worked on—lower speeds for hard or heat-treated steels help extend tool life. Use cutting fluid or coolant to reduce heat and clear chips, and apply steady pressure to maintain alignment. After drilling, withdraw the bit periodically to clear swarf and allow cooling.

Usage recommendations

For best results, use a suitable cutting lubricant, moderate drilling speeds for hardened steels, and proper clamping of the workpiece. Replace bits from the set when wear reduces cutting performance to avoid overheating and workpiece damage.