The WJD3405 Step Drill Bit Set is engineered for professionals and DIY users who demand efficiency, precision, and versatility when drilling through various materials. Each bit is designed with sharp cutting edges and progressive step measurements, allowing you to drill multiple hole sizes without switching tools. Whether you’re working on metal, plastics, or thin materials, this set delivers smooth operation, reduced bit walking, and clean hole finishes. Built with durable construction and universal 1/4" hex shank compatibility, it’s a must-have kit for workshops, technicians, and home improvement enthusiasts seeking reliable performance every time.

Key Features & Specifications

• 5 pcs Step Drill Bit Set

• 1 pcs: 4–12mm, 1mm/step, Shank: 1/4" hex shank

• 1 pcs: 4–12mm, 2mm/step, Shank: 1/4" hex shank

• 1 pcs: 6–18mm, 2mm/step, Shank: 1/4" hex shank

• 1 pcs: 4–22mm, 2mm/step, Shank: 1/4" hex shank

• Multi-size drilling capability for fast transitions

• Designed for thin metals, plastics, and sheet materials

• Smooth cutting action with reduced vibration

• Universal 1/4" hex shank fits most drills

• Durable construction for long-lasting performance