Spiral Step Drill Bit Set AWTools 1077323 M2-TiAlN coating, 3 pcs

AWTools Spiral Step Drill Bit Set 1077323 comprises three spiral step drill bits with M2 high-speed steel substrate and TiAlN (titanium aluminium nitride) coating. The bits are designed to produce progressively larger diameter holes in sheet materials and thin metal plates. Spiral flutes assist chip evacuation and maintain stable cutting action, making this set suitable for workshop tasks and light industrial applications where stepped hole diameters are required.

Advantages

The TiAlN coating increases surface hardness and heat resistance, extending tool life during intermittent and continuous drilling. Spiral geometry improves chip removal and reduces jamming compared with straight-step designs, while the step profile allows multiple hole sizes with a single tool that replaces several conventional drills. Precision ground steps provide consistent hole diameters and cleaner hole edges in thin materials.

Suitable for

• Drilling stepped holes in sheet metal and thin plate
• Fabrication and repair work in workshops
• Electrical enclosure and HVAC installations
• Prototype and small-batch production where multiple hole diameters are needed

Key specifications

• Material: M2 high-speed steel base with TiAlN coating
• Design: Spiral flute step drill bits (3 pieces)
• Application material: Sheet metals and thin plates
• Cutting geometry: Multi-step profile for incremental hole diameters
• Chip evacuation: Spiral flutes for improved chip removal
• Intended use: Workshop and light industrial drilling

How to use

Secure the workpiece and mark the pilot position. Use an appropriate drill press or handheld drill with a steady, moderate feed rate and suitable clamping to prevent movement. Start at low speed to locate the step, then increase speed as the bit advances through the material, allowing chips to clear frequently. Apply cutting fluid when drilling tougher metals or during prolonged cuts to reduce heat and preserve the TiAlN coating performance.

Usage recommendations

For best results, use proper workpiece clamping and moderate spindle speeds appropriate for sheet metals; avoid excessive thrust to prevent chatter or step breakage. Clean chips from the spiral flutes regularly and reapply cutting lubricant for thicker or harder materials.