Drill bit Proline 77802 — 1 piece

Proline 77802 — 1 piece drill bit is a single HSS cutting tool designed for precise drilling in metal, steel sheets and a variety of plastics. The bit combines a titanium nitride coating and a roller shank to improve wear resistance, heat dissipation and compatibility with standard drills. Compact packaging makes it convenient for storage and transport with other drill accessories and for carrying a dedicated replacement bit for maintenance or one-off tasks.

Advantages

The high-speed 4241 HSS substrate provides durability and consistent cutting performance in harder materials, while the titanium nitride coating reduces friction and extends tool life. Self-centring geometry prevents the drill from slipping on rounded or slippery surfaces and maintains clean, burr-free hole edges. The roller shank improves grip in the chuck and facilitates fast bit changes. The design also promotes rapid heat dissipation during sustained drilling operations.

Suitable for

• Drilling holes in metal sheets and thin steel components
• Working with various plastics requiring clean hole edges
• DIY repair and maintenance tasks where a single precise bit is needed
• Light professional work in workshops, construction and metal fabrication

Key specifications

• Material: high-speed steel (4241 HSS)
• Coating: titanium nitride (TiN)
• Shank type: roller shank for improved chuck grip
• Suitable materials: metal, steel sheets, plastics
• Feature: self-centring tip for rounded and slippery surfaces
• Hole quality: clean, burr-free edges

How to use

Mount the drill bit securely in a compatible chuck, ensuring the roller shank seats properly for stable gripping. Use appropriate drill speed and cutting fluid when working with steel or other hard materials to aid heat dissipation and prolong bit life. Apply steady axial pressure and allow the bit to cut without excessive force; the self-centring tip is designed to prevent walking on curved or slippery surfaces. After use, clean chips from the flutes and store the bit in its compact packaging or a suitable holder.

Usage recommendations

For best results when drilling steel sheets and hard plastics, start at a lower speed to establish the hole, then increase speed within the drill's and bit's recommended range. Use cutting oil when working with steel to reduce wear and improve finish; inspect the bit for wear before reuse and replace if the coating is compromised or edges are blunt.