Drill Bit Set Topex HSS for Metal cylindrical 4, 5, 6, 8, 10 mm (55H086)

The Topex HSS cylindrical drill bit set for metal includes five common diameters: 4, 5, 6, 8 and 10 mm. Each bit is made from high-speed steel (HSS) designed for drilling steel and other ferrous materials. The straight-shank (cylindrical) design fits standard drill chucks and drill presses, providing stable concentric rotation for accurate hole making in metalworking, maintenance and fabrication tasks.

Advantages

High-speed steel construction ensures heat resistance and wear durability during repeated metal drilling operations. The set covers a range of frequently used diameters, reducing the need to change tools for typical small-to-medium hole sizes. Cylindrical shanks allow easy mounting in hand drills and bench drills, while the point geometry provides efficient chip removal and consistent hole quality in steel and similar materials.

Suitable for

• Creating round holes in mild and alloy steel
• General metalworking and fabrication
• Maintenance, repair and installation tasks
• Use with hand drills and drill presses
• Workshop and hobby metal projects

Key specifications

• Material: High-speed steel (HSS)
• Shank type: Cylindrical (straight) shank for standard chucks
• Included diameters: 4 mm, 5 mm, 6 mm, 8 mm, 10 mm
• Intended material: Steel and other ferrous materials
• Typical use: Drilling with hand drill or drill press

How to use

Select the drill bit diameter that matches the required hole size and secure it in the drill chuck, ensuring proper tightening to prevent slippage. Set drilling speed appropriate for the material and bit diameter—moderate to high speed for HSS in smaller diameters, lower speeds for larger holes or harder steels. Use appropriate cutting fluid or coolant to reduce heat, prolong bit life and improve chip evacuation. Apply steady axial pressure and keep the drill perpendicular to the workpiece until the hole is complete, then withdraw the bit periodically if needed to clear chips.

Usage recommendations

For best results, clamp the workpiece securely, mark the drilling point with a center punch to prevent walking, and use cutting fluid when drilling ferrous metals. Replace bits that show significant wear or damage to maintain hole precision and safety.