HSS Titanium Step Drill Bit Set 3–20mm | 3-Piece Cone Bit Kit

3-Piece HSS Titanium-Coated Step Drill Bit Set | 3–12mm, 4–12mm, 4–20mm

Tackle any drilling project with confidence using this 3-piece High Speed Steel (HSS) Titanium-Coated Step Drill Bit Set. Whether you're a seasoned tradesperson or a passionate DIYer, these cone-shaped step bits make clean, precise, burr-free holes in metal, wood, plastic, PVC, and more — all with a single tool. No more swapping bits mid-job!

What's in the Set?

• 3–12mm (10 Steps): 3, 4, 5, 6, 7, 8, 9, 10, 11, 12mm | Length: ~7.9cm / 3.11"
• 4–12mm (5 Steps): 4, 6, 8, 10, 12mm | Length: ~6.7cm / 2.64"
• 4–20mm (9 Steps): 4, 6, 8, 10, 12, 14, 16, 18, 20mm | Length: ~7.4cm / 2.91"

Key Features

• Premium HSS Steel Construction: Heat-treated High Speed Steel for long-lasting durability and hardness retention even under demanding use.
• Titanium Coating: Reduces friction, minimizes heat buildup, and extends the working life of each bit — especially during continuous drilling sessions.
• 3-Sided Shank Design: Prevents slipping in the drill chuck, giving you more control and safer operation.
• Dual-Flute Design: Drives faster, smoother, and cleaner cuts with each step clearly labeled with its diameter — no guessing required.
• Multi-Function: Perfect for deburring, chamfering, cutting, and expanding holes in a variety of workpieces.
• Highly Polished Finish: Drills perfectly round holes in steel, brass, plastic, aluminum, wood, and PVC plate (up to 3mm thickness).
• Made in Mainland China.

Compatible Drilling Tools

Works with pistol drills, hand drills, cordless/charging drills, and bench drills.

Recommended Rotating Speeds

• 3–12mm: 260–400 RPM
• 4–12mm: 260–400 RPM
• 4–20mm: 180–240 RPM

Important Usage Notes

• Suitable materials: Wood, plastic, PVC, iron plate, brass, aluminum (general hardness workpieces, plate thickness within 3mm).
• Not suitable for: Stainless steel, spring steel, or quenched/hardened materials.
• Apply a steady downward pressure while drilling — avoid excessive force to prevent edge wear.
• Tip: Use water injection cooling during continuous drilling to significantly extend the service life of your bits.

What's Included?

• 1× Step Drill Bit 3–12mm (10 steps)
• 1× Step Drill Bit 4–12mm (5 steps)
• 1× Step Drill Bit 4–20mm (9 steps)

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Frequently Asked Questions

Q: What materials can the HSS titanium step drill bits cut through?

A: These HSS titanium-coated step drill bits are designed for general-hardness materials including wood, plastic, PVC plate, brass, aluminum, and iron plate (up to 3mm thickness). They are not recommended for stainless steel, spring steel, or any hardened/quenched materials.

Q: What drill types are compatible with this step drill bit set?

A: The 3-sided anti-slip shank is compatible with most standard drill chucks, including pistol drills, hand drills, cordless/charging drills, and bench drills. The 3-sided shank prevents the bit from slipping during operation for safer, more accurate drilling.

Q: How do I extend the life of my step drill bits?

A: To maximize the lifespan of your titanium-coated HSS step drill bits, use water injection cooling during continuous or extended drilling sessions, operate within the recommended RPM range for each bit size, and avoid applying excessive downward pressure which can cause premature edge wear.

Q: Are the step sizes labeled on the drill bits?

A: Yes! Each step on all three drill bits is clearly laser-engraved or marked with the corresponding diameter, so you always know exactly what hole size you're drilling without needing to stop and measure.