Drill bit set ALPEN 4-piece HSS metal spiral drills, 1/4" (6.3 mm) square shank

ALPEN 4-piece HSS metal spiral drill bit set with 1/4" (6.3 mm) square shank is a compact collection of high-speed steel twist drills designed for precise drilling in metals and similar materials. The set includes four HSS bits finished for consistent cutting performance and durability. The 1/4" square shank ensures secure seating in compatible bit holders and quick change systems, reducing slippage during use and enabling efficient workflow in workshop or maintenance environments.

Advantages

The HSS material offers good hardness and heat resistance for general metal drilling, providing reliable wear characteristics under normal operating speeds. The spiral flute geometry efficiently evacuates chips to help maintain cutting action and reduce clogging. The standardized 1/4" (6.3 mm) square shank allows compatibility with a wide range of quick-change holders, hand tools, and drivers that accept square-shank bits, improving versatility and setup speed.

Suitable for

• Drilling through mild steel, iron, brass and non-hardened metal sheets
• Workshop maintenance and repair tasks
• Light industrial and fabrication work
• Use with bit holders, quick-change chucks and driver tools that accept 1/4" square shanks

Key specifications

• Material: High-speed steel (HSS)
• Number of pieces: 4
• Shank type: 1/4" (6.3 mm) square shank
• Drill type: Spiral twist drill for metal

How to use

Select a drill bit size from the set appropriate for the hole required and secure it in a compatible holder or chuck that accepts 1/4" square shanks. Mark the drilling position, clamp the workpiece to prevent movement, and use appropriate cutting lubricant when drilling metals to reduce heat and wear. Start at low speed to establish the hole, then apply steady feed and increase speed within the recommended range for HSS bits and the specific material being drilled. Clear chips periodically to maintain cutting efficiency.

Usage recommendations

Use cutting fluid for extended tool life when drilling steel and iron. Avoid applying excessive axial force; let the drill cut at the correct feed rate. For hardened materials or high-production applications, consider purpose-specific or coated drills.