Drill bit set Proline 76066 HSS 6.6 mm, 10 pcs

Proline 76066 HSS drill bit set contains ten identical 6.6 mm high-speed steel bits designed for general-purpose drilling in metal, wood and plastic. The set is intended for use in workshop, construction and DIY environments where durable HSS geometry and repeatable hole diameter are required. Each bit features a conventional twist profile suitable for use in drill presses and hand drills with standard chucks, providing consistent cutting performance and interchangeability between tools.

Advantages

The bits are made of high-speed steel to maintain hardness at elevated cutting temperatures and to provide reliable wear resistance during repetitive use. A consistent 6.6 mm diameter across the ten-piece pack allows for quick replacement and simplifies inventory for periodic tasks. The conventional point and twist flutes ensure effective chip evacuation for clean holes in a variety of materials, while compatibility with common chucks and drill holders reduces setup time.

Suitable for

• Drilling holes in mild steel, aluminium and other non-hardened metals
• Creating pilot and clearance holes in wood and plywood
• Cutting holes in plastics and composite panels
• Workshop repair, fabrication and maintenance tasks
• General DIY and construction site drilling operations

Key specifications

• Drill bit material: high-speed steel (HSS)
• Nominal diameter: 6.6 mm
• Quantity in set: 10 pieces
• Flute type: spiral twist
• Point angle: standard 118° geometry suitable for general-purpose drilling

How to use

Select a drill or drill press with an appropriate chuck capacity, secure the 6.6 mm HSS bit in the chuck, and tighten according to the tool manufacturer’s instructions. Use suitable spindle speed and feed rate for the material being drilled: higher speeds for soft materials such as plastics and wood, and moderate speeds for metals to avoid overheating. Apply steady axial pressure, clear chips as needed, and use cutting lubricant when drilling metals to extend bit life. After use, remove debris and store the bits in their pack or a dedicated holder to prevent damage.

Usage recommendations

For best results when drilling metals, use a light cutting oil and moderate speed to balance cutting efficiency and bit life. For wood and plastics, use higher speeds and avoid excessive pressure to prevent melting or splintering. Replace bits from the set when signs of wear—such as burrs, chipping or reduced cutting performance—appear.