Uncoated Four Spiral Flute Step Drill Bit Set – 1/8″-1-3/8″ 5PCS

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Uncoated Four Spiral Flute Step Drill Bit Set – 1/8″-1-3/8″ 5PCS  Technical Specifications
Material Type High Speed Steel (HSS)
Finish Types Uncoated
Shank Type Hex
Surface Recommendation Metal, Plastic, Wood
Tool Flute Type Spiral
Number of Flutes 4
One Kit Does It All
A 5-PC step drill set replaces dozens of bits.
Laser-Precise Steps
Each bit has permanent metric/imperial markings.
Dual Hex Shank
Fits both 1/4″ & 3/8″ drills/impact drivers.
Handles metal, wood & plastic
No more swapping—just seamless sizing up.
For Perfect Sizing
Stop at the exact diameter you need for electrical conduit, plumbing every time.
Swap in Seconds
Change bits overhead or in tight spaces without tools. Locked in, no slippage.

Deburring, chamfering, cutting or expanding holes
Support tools: pistol drill, hand drill, charging drill, bench drill. (Water cooling during work can effectively extend the life of the drill bit, especially for continuous drilling)
Application: High quality shavings removal and heat dissipation, low cutting resistance, ideal for cutting
Advantages: Suitable for drill wood, iron, aluminum alloy, insulation board, PVC sheet
Unique Design: High precision, no burrs when drilling and easy to install

Designed for electricians, plumbers, and HVAC contractors, these bits feature an innovative Split Point Tip for fast, accurate starts and up to 6X longer life, while an automated precision grinding process ensures 2X faster cuts with minimal wear. With laser-etched step markings for multiple hole sizes, increased step heights for efficiency, and a ¼” hex shank for compatibility with drills and impact drivers, FLINTOOLS’s Step Drill Bits deliver unmatched performance in thin metals, PVC, and other plastics!

3-Piece HSS Black Step Drill Bits Set Straight Flute With Hexagonal Shank   Drill Clean Holes in Metal, Fast & Effortless: Cuts through steel like a hot knife through butter. Four flutes reduce heat build-up and prevent grabbing for smoother control vs. 2-flute bits. Essential for electricians drilling panels (up to 3/16″) and fabricators. Use with cutting oil for peak performance
One Kit Does It All – From Small Pilot to Large Holes: Covers 90% of drilling tasks with 5 bits ranging from 3/16″-1/2″ (6 steps), 1/4″-3/4″ (9), 3/16″-7/8″ (12), 1/8″-1/2″ (13), to 3/16″-1-3/8″ (19). Start from a precise 4mm pilot, then seamlessly step up for conduit or hardware. Ideal for metal, wood, plastic—use lower speed on soft materials to to prevent over-drilling
Swap Bits in Seconds & Drill with Precision: This step drill bit set includes universal 1/4″ and 3/8″ hex shank to fit your drill or impact driver. It locks securely and enables mechanics to swap bits in tight spaces like under a vehicle without fumbling for tools. Paired with tough, laser-etched markings that resist oil and wear, ensuring reliable, repeatable accuracy on the job
Tackle Truck Frames & Tough Jobs with Confidence: Built with reinforced shanks to handle the demands of drilling through common automotive metals like body panels, brackets, and exhaust components. The balanced geometry reduces “walking” and vibration, making it ideal for installing accessories, performing repairs, or custom fabrication on vehicles. A go-to tool for automotive technicians, serious DIYers and garage enthusiasts-just avoid drilling into high-strength steel frames, axles, or hardened materials
Stays Sharper Longer & Stays Organized: Made of high‑speed steel (HSS) hardened to resist wear, so it maintains its edge through prolonged use. The rugged, compartmentalized case keeps every bit secure and ready, whether you’re on a construction site, in a home garage, or a professional workshop