NEIKO 10628B M35 Cobalt Step Drill Bit, 7/8–1-1/8 in.

Cobalt: The NEIKO 10628B step drill bit is a single-bit option for drilling two listed hole sizes, 7/8 and 1-1/8 inches. Its 1/4-inch hex quick-change shank is intended for quick-change chucks and impact drivers, while its straight two-flute design is aimed at hole expansion and chip removal.

At a glance

Listing describes a straight-flute step bit with two flutes and a 135-degree split-point tip.
The 1/4-inch hex shank is described as fitting quick-change chucks and impact drivers without tightening a conventional drill chuck.
The manufacturer lists hole sizes of 7/8 and 1-1/8 inches and says size markings are engraved on the bit.
Cobalt construction and an AlTiSiN coating are claimed in feature text, while the details fields use different material and finish wording.

Price

$31.10Save 15%

Reference price: ~~$36.74~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

Quick-change hex shank is convenient for compatible chucks and impact drivers.
Two listed hole sizes give the bit a focused use for enlarging holes in that size range.
Straight two-flute design is described as lifting chips and deburring during drilling.

Cons

Only two hole sizes are specified, so this is less versatile than a multi-step bit covering a broader range.

Technical specifications

12 specifications

Identity
Brand (manufacturer field)	Ridgerock Tools, Inc.
Model	10628B

Dimensions and installation
Dimensions listed	4.25 x 1.5 x 1.5 inches
Shank type	Hex

Materials and cutting
Material listed	Cobalt
Cutting diameter	1.13 inches
Finish type	Titanium
Cutting angle	135 degrees
Flute type	Straight
Point style	Split Point
Number of flutes	2
Surface recommendation	Metal

What to know before buying

Listing details to confirm

The listing is inconsistent about construction and finish: the title and feature copy claim M35 cobalt with AlTiSiN coating, while details list Cobalt and Titanium finish. It also calls this a two-step bit with 7/8- and 1-1/8-inch sizes but separately gives a 1.13-inch cutting diameter. Confirm the selected configuration and exact size markings if those distinctions matter.

What’s in the box

Included

Step drill bit

Who is it for?

A good fit for

Buyers who need the two listed hole sizes in a single step bit.
Users with a 1/4-inch quick-change chuck or impact driver seeking faster bit swaps.
Metalworking or DIY tasks where the listed straight-flute, two-flute design suits the material and hole size.

Less suited to

Buyers who need a broad range of hole diameters from one bit.
Users whose drill setup requires a round or tri-flat shank rather than a hex shank.

NEIKO 10628B M35 Cobalt Step Drill Bit, 7/8–1-1/8 in. · photo 2 — Additional product photo 2

Customer reviews on Amazon

5 / 5 · 1 ratings

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There is only a single aggregate rating and no customer comment summary. That very limited rating evidence does not establish a pattern of strengths, concerns, or real-world performance for this bit.

Frequently asked questions

What hole sizes does the listing specify?

Feature text lists 7/8 and 1-1/8 inches. A separate detail gives a 1.13-inch cutting diameter, so check the bit's markings and selected listing if the exact maximum size is critical.

Will it fit an impact driver?

The listing says the 1/4-inch hex shank fits a quick-change chuck or impact driver. It does not establish compatibility with every tool or drilling setup.

What are the bit's material and coating?

Feature text claims M35 cobalt and an AlTiSiN coating, but the details fields say Cobalt and Titanium finish. The listing does not reconcile these descriptions.