Four Spiral Flute Step Drill Bit Set - 5 Pcs Unibit HSS Step Drill Bits

🔩 High-Speed Steel Step Drill - Universal Hole Enlarger for Metal, Wood & Plastic

Industrial-Grade Durability:

Crafted from premium HSS (high-speed steel) with a durable nitride coating, our 5-piece step drill bit set delivers exceptional hardness, wear resistance, and long-term durability. Each bit undergoes rigorous inspection and multiple manufacturing processes to ensure consistent performance—even when drilling through stainless steel.

Precision Four-Flute Design:

Engineered to outperform standard two-flute bits, our four-spiral-flute step drill bit ensures maximum cutting stability, faster chip evacuation, and extended bit life. The upgraded design minimizes wobbling and heat buildup—resulting in cleaner holes and unmatched accuracy, even when drilling into stainless steel and hardened metals.

5-Piece HSS Step Drill Bit Set:

This all-in-one step drill bit set includes 5 high-quality HSS bits with the following diameters: 3/16"-1/2" (6 steps), 1/8"-1/2" (13 steps), 1/4"-3/4" (9 steps), 3/16"-7/8" (12 steps), and 3/16"-1-3/8" (19 steps). Each bit is equipped with a 1/4" or 3/8" hex shank, ensuring compatibility with most standard drills and impact drivers. The set comes neatly organized in a durable blow-molded storage case—perfect for easy transport and quick access on the job.

Multi-scenario Use:

Our step drill Perfect for hole drilling in stainless steel, copper, aluminum, wood, plastic, and carbon steel. Whether you're working on home improvement, auto repair, or electrical installations, this step drill bit set is a must-have for DIYers, professionals, and handymen alike.

Clear Laser Markings:

Each step drill bit features laser-etched size markings that stay visible even after extended use—no more guessing or measuring. Combined with sharp cutting edges and a balanced design, you’ll get smooth drilling every time with less effort and more control.

After-sales Service: At Newmkr, we stand behind the quality of our tools. Should you face any problems, our expert after-sales team is here to provide fast and reliable assistance—just email us and we’ll take care of the rest.