EZARC M35 Cobalt Step Drill Bit (1/4"–3/4") AlTiN Coated

What people love (and don’t love)

What people love

Sharp and durable, holding up well through multiple uses.
Good quality and well-made with a strong 1/4″ hex shank.
Performs well on metal, including steel and stainless steel.
Competitively priced compared to premium brands like Milwaukee.
Coating (AlTiN or black oxide) helps with wear resistance and smooth cutting.

What people don’t love

Some users experienced breakage and dulling quickly, especially on aluminum.
Can be too aggressive for inexperienced users, leading to larger-than-intended holes.
Reported quality inconsistencies; some bits fail early or struggle with stainless steel.
Not as reliable or durable as higher-end brands for heavy or continuous use.

Sharp and effective step drill bits with good value, but occasional quality and durability issues may arise.

Summary based on customer review evidence.

Check price on Amazon

Quick facts

Brand: ‎EZARC
Price: USD 19.76
Rating: 4.30 (287 reviews)

If you want one bit that can open up multiple hole sizes without swapping tools, the EZARC Step Drill Bit covers nine common diameters from 1/4" to 3/4". Its spiral flute, triple-flute layout is designed for added stability while drilling, helping reduce wandering and supporting smoother cutting.

You can view the current price and full details on Amazon here.

Built from M35 cobalt high-speed steel (heat treated) and finished with an aluminum titanium nitride (AlTiN) coating, this step bit is engineered for wear resistance and heat performance during demanding jobs. The 1/4" hex shank makes it a convenient fit for many drills and drivers that accept hex-shank bits.

Important use notes: It’s intended for metal sheet up to 1/8" (3 mm) thick and stainless steel sheet up to 1 mm thick. For continuous operation, add cutting oil or use coolant; and expect startup speed may be slower due to the larger cutting angles.

Triple-flute “C-profile” cutting edge designed for stability, smoother cutting, and faster cutting speed
M35 cobalt high-speed steel with heat treatment for toughness and bending strength vs. standard HSS
AlTiN coating (rated 89 HRC per manufacturer) for heat, wear, and corrosion resistance with low friction
9 step sizes in one bit: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"
1/4" hex shank with spiral flute design for versatile drilling in metal, stainless steel, aluminum, and plastic

For shoppers comparing step bits, this EZARC option stands out as a single-piece solution with cobalt steel construction, a wear-focused coating, and clear guidance on recommended material thickness—helpful if you’re drilling sheet goods and want consistent results.