Skip Content

HSS Step Drill Bit,3/16-7/8 In,Step 1/16 close
close x

Using 360° Viewing:

  1. Rotate: Use top-to-bottom, side-to-side by use of mouse arrow.
  2. Zoom In: Double click on image.
  3. Zoom Out/Reset: Put photo at full zoom & then double click.
How can we improve our Product Images?

HSS Step Drill Bit, 3/16-7/8 In, Step 1/16


Price: $46.50 / each

Please sign in or register to access lists

Confirm ZIP Code to determine availability.


Invalid Zip Code


Ship to: (Change)


Invalid Zip Code

  • Item # 6A922
  • Mfr. Model # UNIBIT 4
  • NSN # 5133-01-372-2312
  • UNSPSC # 27112801
  • Catalog Page # 993
  • Shipping Weight 0.2 lbs.
Country of Origin USACountry of Origin is subject to change.
Note: Product availability is real-time updated and adjusted continuously. The product will be reserved for you when you complete your order. More

Technical Specs

  • ItemStep Drill Bit
  • Shank Size3/8"
  • Number of Hole Sizes12
  • Size3/16 to 7/8"
  • Step Thickness1/16"
  • MaterialHigh Speed Steel
  • DesignEnsures True Starts Without Walking Even on Curved Surfaces

Compliance and Restrictions



Features a Speed Point™ tip design and single flute cutting edge that lets you drill multiple diameter holes in aluminum, brass, copper, PVC, steel, wood, and laminates up to 1/8" thick.

Product content provided by supplier

Alternate Products

Alternate Search Terms

Rated 4.5 out of 5 by 2reviewers.
Rated 5 out of 5 by THE.BEST - A must for stainless The Unibit is an incredible tool. I'm a sculptor and interactive museum designer/fabricator, and often need to drill larger holes through stabiles steel pile and sheet. This can easily destroy even the titanium bits, also brand new twist bits as the stainless work hardens. These cobalt Unibits effortlessly plow through the metal one step size at a time in seconds with beautiful results, even with a hand drill. One bit drills hole after hole. I could not recommend more highly. August 31, 2014
Rated 4 out of 5 by These are great bits for making larger holes in mild steel and plastic. If you're making large holes in stainless steel, I suggest you get the cobalt version of it, though. I ruined one making a hole in a piece of stainless plate, even with plenty of lubrication while drilling it. May 6, 2014
1-2 of 2

Product Reviews Disclaimer:
Grainger is neither responsible for, nor does it endorse, the content of any product review or statement posted. Any statements posted constitute the statements of the poster and are not the statements of Grainger. The statements posted by Grainger employees with the Grainger employee badge represent the views of such employees and are not the statements of Grainger. Grainger makes no representations as to the appropriateness, accuracy, completeness, correctness, currentness, suitability, or validity of any product review or statements posted, including those posted by employees with the Grainger employee badge, and is not liable for any losses, injuries or damages which may result from any such product review or statements. Use of any linked web site provided in a product review or post is at the user's own risk.

Product Q&A

(1 Question : 1 Answer)

Ask your questions. Share your answers.

« Back
If not, What type of bit does go into glass?
Field of Industry:: Teacher
Product used for:: Drilling into glass block
Years purchasing from Grainger:: 20
2 years, 7 months ago
Read all my Q&A
Please wait while more information about rehirt is loaded.
Additional information about rehirt could not be loaded.
0out of 0found this question helpful.
Was this helpful?helpful0unhelpful0
1 Person needs an answerI have this question too


No. Step drill bits like this one are designed for drilling in fairly thin metal. (Thinner than the step depth.)

For a glass block, you are going to want to use a drill bit that is specified as a glass / ceramic drill bit, such as 3AEE2.

One thing I can tell you from experience, you will want the glass you are drilling to be under water if at all possible. That way you will keep the drill bit cool and lubricated (both are very important), and if you accidentally shatter the glass you are drilling, then the shards won't fly everywhere.

Also, take your time.

Glass and ceramic drill bits use an abrasive to rub their way through the work, as opposed to cutting, like traditional drill bits do, so they are more susceptible to heat build up.
Age: 25 to 34
2 years, 7 months ago
Read all my Q&A
Please wait while more information about Phil is loaded.
Additional information about Phil could not be loaded.
0out of 0found this answer helpful.
Was this helpful?helpful0unhelpful0
1 of 1
1 of 1