HSS Titanium Step Drill Bit Set 4-12 4-20 4-32mm – 3 Pcs

3-Piece HSS Titanium-Coated Step Drill Bit Set

Tackle any drilling project with confidence using this professional-grade 3-piece spiral step drill bit set. Made from HSS 4241 High Speed Steel with a titanium alloy coating, these cone-shaped step bits cut through iron plate, aluminum plate, PVC sheet, insulation boards, and more — quickly, cleanly, and with minimal effort. Made in Mainland China.

Why Choose This Step Drill Bit Set?

• Titanium-Coated for Durability: The titanium alloy coating drastically reduces friction and heat buildup during drilling, extending the life of each bit well beyond uncoated alternatives.
• Double Cutting Blade Design: Dual cutting edges ensure faster, smoother cuts and automatically deburr holes as you drill — no extra finishing step needed.
• Universal 1/4" Hex Shank: The hex shaft drive is compatible with virtually all standard power drills and drill drivers, so you can get to work right away.
• Tapered Step Design: The stepped cone profile makes it easy to drill a range of hole sizes without swapping bits, and works perfectly for enlarging existing holes too.
• 29 Size Steps in One Set: Three bits cover 29 distinct drilling diameters — from 4mm all the way up to 32mm — giving you incredible versatility in a single kit.

Size Guide

• 4–12mm (64mm length): 5 steps — 4, 6, 8, 10, 12mm
• 4–20mm (74.5mm length): 9 steps — 4, 6, 8, 10, 12, 14, 16, 18, 20mm
• 4–32mm (103mm length): 15 steps — 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm

Specifications

• Material: HSS 4241 High Speed Steel
• Coating: Titanium alloy
• Shank: 1/4" Hex
• Suitable Materials: Iron plate, aluminum plate, PVC sheet, insulation boards (hardness <25°)
• Package Includes: 3 × HSS Step Drill Bits (4-12mm, 4-20mm, 4-32mm)
• Country of Origin: Made in Mainland China

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Frequently Asked Questions

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

A: These titanium-coated HSS step drill bits are designed for materials with a hardness of less than 25 degrees, including iron plate, aluminum plate, PVC sheet, and insulation boards. They are not recommended for hardened steel or masonry.

Q: Are these step drill bits compatible with my drill?

A: Yes! All three bits feature a standard 1/4" hex shank, making them compatible with virtually all power drills, cordless drill drivers, and drill presses that accept hex-shank bits.

Q: Do I need to deburr the holes separately after drilling?

A: No. The double cutting blade design of these step drill bits automatically deburrs holes as you drill, leaving clean, smooth edges without the need for additional finishing tools.

Q: What is included in the package?

A: The package includes 3 HSS titanium-coated step drill bits: one 4–12mm (5 steps), one 4–20mm (9 steps), and one 4–32mm (15 steps), covering a total of 29 drilling sizes.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.