EZARC M35 Cobalt Step Drill Bit, 3/16″–7/8″, 5/16″ Hex Shank

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Product guide

EZARC M35 Cobalt Step Drill Bit, 3/16″–7/8″, 5/16″ Hex Shank

The EZARC M35 cobalt step drill bit covers 12 hole sizes from 3/16″ to 7/8″ in one bit. Its listing specifies a 5/16-inch hex shank, triple-flute design and AlTiN coating, with stated limits of 1/8-inch metal sheet and 1 mm stainless steel.

At a glance

One stepped bit provides 12 hole sizes, reducing bit changes for size adjustments within its stated range.
The 5/16-inch hex shank is described as fitting 1/4-inch quick-change chucks.
The listing describes a spiral triple-flute design with a C-profile cutting edge.
Manufacturer guidance recommends low speed, light pressure and lubricant for continued drilling.

Price

$25.47Save 15%

Reference price: ~~$29.97~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

Twelve size steps from 3/16″ to 7/8″ give a useful range for holes in thin sheet material.
A hex shank is specified for quick-change chuck compatibility, and the listing also describes use with impact drivers.
The specified material and coating are positioned for work on metal, including stainless steel, as well as aluminum and plastic.

Cons

The stated thickness limits narrow its use to metal sheet up to 1/8 inch and stainless steel sheet up to 1 mm.
The listing notes that initial drilling may be slower because of the larger cutting angles.

Technical specifications

11 specifications

Identity
Brand	EZARC

Materials and protection
Material listed	Cobalt Steel
Finish	Titanium Aluminum Nitride

Cutting and fit
Size range	3/16"-7/8"
Step sizes	3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8".
Shank type	5/16" Hex Shank
Flute type	Spiral
Number of flutes	3
Surface recommendation	Aluminum, Metal, Plastic, Stainless Steel, Wood

Stated operating limits
Metal sheet thickness	up to 1/8" (3mm)
Stainless steel sheet thickness	up to 1mm

What to know before buying

Listing details to confirm

Use is specified for metal sheet up to 1/8 inch (3 mm) and stainless steel sheet up to 1 mm. For continuous drilling, the manufacturer recommends cutting oil or coolant, low speed and light pressure. Customer feedback also reports durability concerns and mixed drilling-capacity experiences, including a report of difficulty using an impact drill, despite the listing's stated impact-driver compatibility.

What’s in the box

Included

Step drill bit (3/16″–7/8″)

Who is it for?

A good fit for

Buyers drilling multiple hole sizes in thin metal sheet, aluminum or plastic who want a single step bit.
Users with a 1/4-inch quick-change chuck seeking a hex-shank bit in this size range.

Less suited to

Drilling metal thicker than the stated sheet limits or stainless steel thicker than 1 mm.
Buyers looking for a set of several separate bits or documented durability for sustained heavy use.

EZARC M35 Cobalt Step Drill Bit, 3/16″–7/8″, 5/16″ Hex Shank · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.2 / 5 · 427 ratings

5 stars68%68%
4 stars12%12%
3 stars8%8%
2 stars1%1%
1 star11%11%

Customer feedback praises perceived quality, sharpness and cutting performance, with some reports of effective cutting through mild steel. Durability is a notable concern in the supplied feedback, which includes reports of bits breaking within a week. Drilling capacity and value are mixed, and one customer reports difficulty using an impact drill. These experiences matter for buyers planning repeated or demanding work, especially since the listing specifies thin-sheet limits and recommends controlled speed and lubrication.

Positive themes

Customers describe the bit as sharp and report good cutting performance, including on mild steel.

Negative themes

Some customers report bits breaking within a week of use.

Mixed feedback

Feedback on drilling capacity and value varies. One customer says they could not use it with an impact drill, while the listing describes impact-driver use.

Frequently asked questions

What hole sizes does this step drill cover?

The listing gives 12 steps from 3/16 inch through 7/8 inch. The individual sizes are listed in the specifications.

How thick a sheet is it intended for?

The manufacturer states up to 1/8 inch (3 mm) for metal sheet and up to 1 mm for stainless steel sheet.

Does it fit a quick-change chuck?

The listing specifies a 5/16-inch hex shank and says it fits 1/4-inch quick-change chucks. Customer feedback includes a contrary report about using it with an impact drill, so confirm suitability for your particular tool and work.

What should I know about drilling technique?

The manufacturer recommends low speed and light pressure, and cutting oil or water-soluble lubricant to reduce friction, heat and debris. It notes that initial drilling can be slower.