Professional-Grade Step Drilling Solution
The Harden 3Pcs Step Drill Bit Set (614143) delivers precision drilling performance for metalworkers, carpenters, and DIY enthusiasts. Crafted from heat-treated High-Speed Steel (HSS) with titanium nitride coating, these spiral flute bits offer exceptional durability and heat resistance.

Key Features:

• Titanium Coated Surface: Reduces friction and extends bit lifespan

• Precision Ground Steps: 4-12mm (1mm/step), 4-20mm (2mm/step), 4-32mm (2mm/step)

• Spiral Flute Design: Efficient chip removal for cleaner holes

• Multi-Material Compatibility: Ideal for sheet metal, aluminum, wood, PVC, and plastics

• Professional Finish: Burr-free results with smooth edges

Technical Specifications:

• Material: HSS with Titanium coating

• Size Range:

  • 4–12mm (1mm step)

  • 4–20mm (2mm step)

  • 4–32mm (2mm step)

• Shank Diameter: 6.35mm (1/4″) Standard

• Flute Type: Spiral Core Design

Perfect for electricians, mechanics, and DIY enthusiasts, the heat-treated HSS construction ensures long life and reduced wear. Whether you’re in a workshop or on-site, this drill bit set delivers reliable performance every time.