Heavy-Duty HSS Drill Set
Master Multiple Hole Sizes with One Durable Set
Premium HSS Step Drill & Countersink bits designed for fast, clean cuts through metal, wood, and plastic. The essential upgrade for your workshop.
Your Complete Drilling & Chamfering Solution
This versatile set combines multi-size step drills for creating various hole diameters and precise countersink bits for flush screw heads, streamlining your entire workflow.
Superior Stability with 4-Flute Spiral Design
Engineered for demanding tasks, our larger step bits feature an advanced four-flute spiral design. This ensures faster chip removal, reduced heat buildup, and significantly smoother, rounder holes compared to standard straight-flute bits.
Secure Quick-Change & Precise 85° Countersinking
Every bit features a universal 1/4" hex shank that locks securely into impact drivers and quick-change chucks, preventing slippage under load. The dedicated countersink bits provide a precise 85° angle for perfect screw fitment without chatter.
Technical Specifications
| Feature | Detail |
|---|---|
| Material | High-Speed Steel (HSS) |
| Shank Type | 1/4" Quick-Change Hex Shank |
| Flute Type (Step Bits) | Spiral Flute (4-flute on larger sizes) |
| Countersink Angle | Approx. 85 Degrees |
| Compatible Materials | Metal, Aluminum, Wood, Plastic, Fiberglass |
Frequently Asked Questions
Do I need to use cutting fluid when drilling metal?
Yes, using cutting fluid or lubricant is highly recommended when drilling metals like steel or aluminum. It significantly reduces heat buildup, extends the life of the bit, and results in a cleaner cut.
Will the hex shank fit my impact driver?
Yes, these bits feature a standard 1/4" hex shank designed to fit securely into most impact drivers and quick-change drill chucks universally.
What is the advantage of the spiral flute over a straight flute?
Spiral flutes are more efficient at ejecting metal shavings and chips from the hole as you drill. This reduces clogging and heat, allowing for faster, smoother drilling and a longer bit lifespan.