3PCS HSS Cobalt Step Drill Bit Set – Sizes 3–12mm, 4–12mm, 4–20mm

📖 Description:

• This set includes 3 high-speed steel (HSS) cobalt step drill bits designed for precise and clean drilling through metal, plastic, and wood. Sizes: 3–12mm, 4–12mm, and 4–20mm, ideal for enlarging holes and deburring. The cobalt coating ensures durability, heat resistance, and long tool life, making it a must-have for DIYers and professionals.

🔧 Key Features

• Material: High-Speed Steel (HSS) with cobalt content for enhanced durability.
• Coating: Titanium or nitrogen coating to reduce friction and increase wear resistance.
• Shank Type: Hexagonal shank for secure grip in drill chucks.
• Flute Design: Two-flute design for smooth cutting and efficient chip removal.
• Applications: Suitable for drilling and enlarging holes in thin materials, including sheet metal, aluminum, plastic, and wood.​