EZARC Step Drill Bit for Metal M35 Cobalt - Durable AlTiN Set

Our review of the EZARC Step Drill Bit set finds it best suited for DIYers and tradespeople who frequently cut thin metal sheets and need a compact, fast-cutting solution. The biggest reason to buy is the combination of an M35 cobalt core and AlTiN coating, which together deliver noticeably improved heat and wear resistance compared with ordinary HSS step bits, especially when drilling thin steel, aluminum or plastic. It is a practical 3-piece kit that comes in a compact case and performs well for through-hole enlargement and pilot hole work.

Key Features

• C-Profile triple-flute: The C-profile cutting edge and triple-flute design reduce deviation and stabilize cuts for smoother holes.
• M35 cobalt HSS: Heat-treated M35 material increases toughness and bending strength, making the bits better suited to harder metals than plain HSS.
• AlTiN coating: Aluminum titanium nitride coating provides high hardness and thermal protection so the bits resist wear and retain edge life under heat.
• Compact 3-piece set: Three stepped sizes in a small case keep bits organized and ready to transport for jobsite or workshop use.
• Spiral flute and stepped design: The stepped profile and spiral flutes allow efficient drilling through a range of hole sizes without switching bits.

Who It's For

This set is ideal for hobbyists, handymen, and professionals who drill sheet metal up to about 1/8 in thick (3 mm) and occasional stainless up to 1 mm thick, where speed and heat resistance matter. It suits users who need to enlarge holes or make multiple hole sizes quickly without changing bits.

Those who should look elsewhere include fabricators who regularly cut thicker plate or heavy production shops that demand extreme longevity under continuous, high-duty drilling; for continuous heavy work a purpose-built production bit or carbide option may be better. Also, users expecting instantaneous startup speed on every metal type should note the larger cutting angles can require a slower initial feed.

Pros & Cons

Pros

• Excellent heat and wear resistance from the AlTiN coating, extending useful life in hotter cuts.
• Improved toughness and bending strength thanks to the M35 cobalt material, useful on harder metals.
• Stable, smoother cutting due to the C-profile triple-flute design, which helps reduce wobble.
• Neat, portable 3-piece set with a compact case for easy storage and transport.

Cons

• Durability reports are mixed in heavy use; some users noted breakage when pushed hard or used without coolant.
• Startup speed may be slower on some metals because of the larger cutting angles, so drilling technique matters.

Specifications

Brand	EZARC
Material	M35 cobalt high-speed steel
Coating	AlTiN (aluminum titanium nitride), rated 89HRC
Set	3 pcs step drill bits in compact case
Shank	1/4 in hex shank
Material thickness	Metal sheet up to 1/8 in (3 mm); stainless up to 1 mm

Our Verdict

The EZARC M35 step drill set is a sensible choice for anyone who needs a compact, heat-resistant step bit solution for sheet metal work; its M35 construction and AlTiN coating give it an edge over plain HSS for harder metals and intermittent heavy cuts. It represents good value for small shops and DIYers, provided users observe proper coolant use and avoid continuous extreme-duty applications where bit life may suffer.

Frequently Asked Questions

What thicknesses can these bits handle?
They are suitable for metal sheet up to 1/8 in (3 mm) and stainless steel up to 1 mm; use cutting oil or coolant for continuous operation.

Do these fit standard drills?
Yes, the bits have a 1/4 in hex shank that fits most cordless and corded drills and drill presses with a matching chuck.

Are they good for stainless steel?
The M35 cobalt and AlTiN coating make them appropriate for light stainless work up to 1 mm, but heavy or continuous stainless cutting may reduce lifespan.