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Irwin 10231 Unibit #1 13-Step 1/4-Inch Step Drill Bit, 1/32-inch Steps (1/8- to 1/2- inches) Save time by eliminating the need to change drills when drilling round holes in thin materials. Each smaller size drill also acts as a pilot for the next size. Patented single-flute cutting edge gives greater control through steps and a true round hole every time. Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates. SpeedPoint tip penetrates faster than previous Unibits and prevents walking. 3-faltted hex shank prevents slipping in drill chuck. Drill diameters etched in flute for easy identification.
From the Manufacturer
UNIBIT 1 13 Hole Sizes (1/8"-1/2"), 1/32" Increments
Louie
Reviewed in the United States on March 5, 2025
Love this step bit , great for impact !
BOB SHEA
Reviewed in the United States on September 29, 2024
Very Niiicccce.
Customer
Reviewed in the United States on May 22, 2024
All good as described.
zhenrong yang
Reviewed in the United States on March 5, 2024
I bought this one to drill an end pin hole on my guitar for pickup installation. It worked flawlessly.
serge grignon
Reviewed in Canada on February 19, 2024
Le forêt a un embout plat donc il patine sur le metal
rosy1111
Reviewed in the United States on November 5, 2024
Didn't know these existed til now! Especially useful when having to make a pilot hole first, before drilling a larger hole.
Michael
Reviewed in Canada on November 25, 2024
It kept wanting to walk even with vise and drill press.Hole is not concentric.
Anonymous1
Reviewed in the United States on October 4, 2023
It does a clean and professional drill every time and is made of high quality material that doesn’t easily break, also the value was very good
ACG Electrify
Reviewed in Canada on October 1, 2020
Cuts through sheet metal with ease. I have used Irwin and I have used Klein unibits. The Irwin bits stay sharper longer.
Robert Phifer
Reviewed in the United States on January 24, 2020
This is an excellent choice for anyone looking to use snap toggles through metal studs. (Also I'm sure for a million other purposes but that is what I regularly use it for)Goes through quickly and cleanly.
Eric S.
Reviewed in the United States on August 8, 2017
Bought this as a replacement for one I work out. They are well made, I just used it that much (probably abused it a bit to). My hobby is restoring muscle cars and these bits work perfect for drilling metal. Drilling sheet metal it leaves a very clean hole (unlike a normal bit). Have also used it on thick metal (3/8" steel).
Philip Cowing
Reviewed in the United Kingdom on September 27, 2015
Superb highly recommend
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