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Irwin Tools IRWIN Step Drill Bit, 3/16-Inch to 7/8-Inch, 3/8-Inch Shank (10234)

4.6 out of 5 stars 884 ratings

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Size: #4 (3/16-7/8")
Style: High Speed Steel
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Purchase options and add-ons

Material High Speed Steel (HSS)
Finish Type Black Oxide
Shank Type 3-Flat
Brand IRWIN
Item dimensions L x W x H 3 x 1 x 6.2 inches

About this item

  • Save time because you don't need to change drills for different-sized round holes in thin materials. Each drill acts as a pilot for the next size.
  • Made from industrial-grade high-speed molybdenum steel heat treated for maximum durability. SpeedPoint tip penetrates faster and prevents walking.
  • Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates.
  • Non-skid tip, no need for center punches. 3-faltted hex shank prevents drill chuck slipping. Drill diameters etched in flute for easy identification.
  • Backed by a full lifetime warranty.

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 3 x 1 x 6.2 inches; 0.01 ounces
  • Item model number ‏ : ‎ 10234
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ April 1, 2004
  • Manufacturer ‏ : ‎ IRWIN
  • ASIN ‏ : ‎ B00004THZ0
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.6 out of 5 stars 884 ratings

WARNING:

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Product Description

Product Description

Irwin 10234 Unibit #4 12-Step High Speed Steel 3/8-inch Step Drill Bit, 1/16-inch Steps (3/16- to 7/8-inch) 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. Made from industrial-grade high-speed molybdenum steel heat treated for maximum durability. 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. Non-skid tip does away with the need for center punches; 3-faltted hex shank prevents slipping in drill chuck. Drill diameters etched in flute for easy identification. Backed by a full lifetime warranty.

Amazon.com

The Irwin 10234 UniBit #4 12-Step High Speed Steel Fractional Self-Starting Step Drill has a single-flute cutting edge to give you more control and produce true, round holes. Twelve holes range from 3/16 to 7/8 inches, in 1/16-inch increments. A non-skid tip does away with the need for center punches, while the three flatted shanks prevent slipping in the drill chuck. This drill is made from industrial-grade high-speed molybdenum steel heat treated for maximum durability, and it is ideal for work on thinner materials. The multiple steps mean you don't have to have a toolbox with specific size drill bits, and this drill is backed by a full lifetime warranty.

Top Brand: IRWIN

Highly Rated
100K+ customers rate items from this brand highly
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From the manufacturer


For over a century, innovation has been the hallmark of IRWIN TOOLS. Beginning in 1885, with the development of the first IRWIN Auger Bit, and progressing with the introduction of Vise-Grip Locking Tools, SPEEDBOR Flat Bits, MARATHON Saw Blades, QUICK-GRIP Bar Clamps, and UNIBIT Step Drill Bits, IRWIN has been at the forefront of the industry, creating superior tools for the professional tradesman.

IRWIN UNIBIT Step Drill Bit #2, 3/16 inch-1/2 inch (6 Steps)

Perfect Hole-Drilling in Metal

IRWIN UNIBIT Step Drill Bits give you maximum drill control to create clean, burr-free holes in metal perfectly sized every single time. With laser-etched sizes inside the flute, hole sizes are easy to identify to prevent over-drilling.

  • SpeedPoint tip for fast starts.
  • Single fluting cutting edge drills clean, true holes.
  • Crafted of durable, high-speed steel.

Precision Crafted

When you're drilling metal, there's no room for error. That's why UNIBIT step drill bits have been designed to deliver clean and accurate holes every time to get the job done right. Precise drilling has never been easier.

Laser-Etched Sizes

Sizes are laser etched into the metal so that they will not wear off even after repeated use.

Clean, Precise Drilling

The SpeedPoint tip is guaranteed to start fast while the single flute design delivers holes that are drilled cleanly and precisely in a variety of materials including mild steel, acrylic glass, laminate, and more.

Step Drills for Every Application

For every trade, application, and material, IRWIN provides the long-lasting accuracy and durability you need.

What's in the box

  • STEP DRILL #4 3/16-7/8" 12 SZ
  • STEP DRILL #4 3/16-7/8" 12 SZ
  • STEP DRILL #4 3/16-7/8" 12 SZ
  • STEP DRILL #4 3/16-7/8" 12 SZ
  • STEP DRILL #4 3/16-7/8" 12 SZ
  • Customer reviews

    4.6 out of 5 stars
    884 global ratings

    Review this product

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    Customers say

    Customers find the drill bit works well for its intended purpose, with a razor-sharp cutting edge that maintains sharpness for at least 40 holes. They appreciate its durability, with one customer noting it lasted through a dozen holes, and its accuracy in creating perfect holes, particularly in stainless steel. Customers praise its value for money, quick operation, and suitability for tight spaces, with one mentioning it's great for drilling out guitar pickup endjacks.

    106 customers mention "Functionality"102 positive4 negative

    Customers find that the drill bit works well for its intended purpose, with one customer specifically noting its effectiveness on thin metals.

    "...I have used the Unibit for this exact purpose, and it worked beautifully, with no damage to the guitar...." Read more

    "...This half size bit did the trick beautifully. It’s very sharp and the hole came out very clean. I’m very happy to find this unique bit." Read more

    "...Worked perfectly, round hole unlike a typical twist drill bit." Read more

    "...I had never installed a pickup before and this 1/2 inch unibit worked perfectly. It will get the job done neatly...." Read more

    41 customers mention "Cutting edge"34 positive7 negative

    Customers praise the drill bits' cutting edge, noting they are razor sharp and produce clean cuts, with one customer mentioning they stay sharp for at least 40 holes.

    "...This half size bit did the trick beautifully. It’s very sharp and the hole came out very clean. I’m very happy to find this unique bit." Read more

    "...This bit was easy to use, sharp, and made a very nice clean hole for my endpin jack install...." Read more

    "...It cut smoothly and did not bind up at all. The hole it made was perfectly round and no burs left on the front side...." Read more

    "...bit as a result of chipping, this bit held up just fine and still cuts mild steel like it was made of butter...." Read more

    37 customers mention "Durability"31 positive6 negative

    Customers find these drill bits durable, with multiple reviews noting their good quality and no signs of damage. One customer mentions they lasted through a dozen holes, while another describes them as well-made for metal work.

    "...for this exact purpose, and it worked beautifully, with no damage to the guitar...." Read more

    "...A fine guitar is made of fine woods and a fine finish so a drill bit which rips or tears at the finish or even leaves a scratch or rough spot at..." Read more

    "...A quick summary: Irwin tools are dependable and are of very good quality...." Read more

    "This Irwin step-drill was reasonably priced and has lasted about the longest of any I've had in this size range...." Read more

    33 customers mention "Drill accuracy"29 positive4 negative

    Customers are satisfied with the drill bits' accuracy, noting that they produce perfect and round holes, with one customer mentioning they work well for reaming out metal holes.

    "...On the other hand, this Irwin Unibit could be used to drill a tapered hole, using the strap button screw hole as a pilot hole, followed by the..." Read more

    "...Worked perfectly, round hole unlike a typical twist drill bit." Read more

    "...It is just the right size to make a hole in metal enclosures for the draw stud of my 1/2" Greenlee manual KO punch, which I will often use to make..." Read more

    "...It cut smoothly and did not bind up at all. The hole it made was perfectly round and no burs left on the front side...." Read more

    32 customers mention "Value for money"25 positive7 negative

    Customers find these drill bits to be good value for money, with one customer noting that the cobalt steel version is worth the extra cost.

    "This Irwin step-drill was reasonably priced and has lasted about the longest of any I've had in this size range...." Read more

    "...The cobalt steel is worth the extra $$. This is also a GREAT price! Things to keep in mind:..." Read more

    "...cuts in clockwise and counterclockwise direction, which means better value for you because you really have two cutting edges...." Read more

    "...Irwin Unibits are pretty expensive compared to other brands, but if you want the very best and longevity, definitely get Irwin cobalt bits. ***..." Read more

    27 customers mention "Drill bit quality"27 positive0 negative

    Customers praise the drill bit's quality, particularly its effectiveness for drilling through thin stock and sheet metal work. One customer mentions it's perfect for guitar pickup endjacks, while another notes it saves time compared to regular bits.

    "...This is a must have tool in a guitar workshop." Read more

    "This easily drills sheet metal and angle iron the steps make it convenient, not having to change out drillbits...." Read more

    "...Great drill bit and very durable. The first one has drilled many many holes in materials often thicker than it was rated for...." Read more

    "...It cuts through metal much easier than the traditional drill bits and its so easy to step up the size of the hole...." Read more

    20 customers mention "Speed"15 positive5 negative

    Customers appreciate the drill bits' speed, with one customer noting they start easily with or without a pilot hole.

    "Irwin has always been a great Step Drill when used as it should be with sheet metal...." Read more

    "...Presto...a clean wonderful hole was drilled quickly. I am now a true believer in step bits. This bit also kept its edge very well...." Read more

    "...its heavy shank won't fit on an impact drill, and its not hard enough to drill a mower blade (hardened steel)...." Read more

    "...I have found them to be the fastest way of drilling thin walled metal (< 4 mm) round and square pipe on site, and they leave a clean circular..." Read more

    14 customers mention "Size"11 positive3 negative

    Customers appreciate the drill bits' size, noting they are perfect for tight spaces and easy to step up, with one customer mentioning they contain all common sizes they need.

    "...It cuts quickly and precisely. The holes it produces are smooth with crisp edges." Read more

    "...metal much easier than the traditional drill bits and its so easy to step up the size of the hole...." Read more

    "Contains all common size I need and the cutting edge is sharp. I bought this to make a hole for gasoline can vent cap...." Read more

    "...base and end block, leaving a 1/2" hole that is slightly oversized for most endpin jacks, but completely usable...." Read more

    High Quality Bit, Works well in Plastic, Metal, Wood
    5 out of 5 stars
    High Quality Bit, Works well in Plastic, Metal, Wood
    This Irwin 10232 Unibit is a high quality set step drill, made in the USA. While it does cost more than competing off-shore bits it is also significantly superior in all respects. The Good: Smooth, sharp cutting edges allows one to produce clean accurate holes with ease in thin metal, plastic and wood. Pointed tip does indeed prevent the bit from wandering or skipping when starting a hole. No counterpunch or pre-drilling required to achieve accuracy. The shank is formed to fit 1/4” hex drivers. The amazon product photo does not show these newer driver style shanks (at the time of this review). Markings are highly visible and easy to read. The quality workmanship of this product is obvious: sharp, finely machined, highly visible markings. The Bad: There really isn’t anything serious to complain about, so consider the following list to be nit-picking… The bit fits standard 1/4” hex drivers, but the shank section before the groove is a bit shorter than normal (see photo). This is no problem whatsoever in magnetic drivers. In my non-magnetic Makita impact driver the bit had slightly more in-and-out play than usual, but it did not affect drilling performance. (I warned you I was nit-picking!). Summary: If you enjoy using top quality tools then this set is worthy of your consideration. If you like short reviews - stop here! On the other hand, if you like lots of extra information, then please by all means read-on… The bit has a hex shank for positive slip-free use in standard drill chucks. This #2 bit also fits in standard 1/4” drill drivers, impact drivers, etc. At the time of this review, the amazon description states they have a “3 flatted shank” which is not accurate - mine has a six sided shank, also known as a “hex” shank. Irwin Unibit #2: Irwin Item #: 10232 Hole Sizes: 3/16” - 1/2” Step increment: 3/8” Number of steps: 6 Step Height (i.e. max material thickness): 3/8” Overall Length: 3-1/8” Shank Size Across flats: 1/4” Drill Chuck Required to hold shank: 1/4” I happen to own some low cost import step drill bits (a Neiko 10193A set, in near new condition). It is immediately obvious that the Irwin bit’s are better quality than the Neiko’s in appearance and legibility of the step-size markings. I’ll post a picture showing an Irwin and Neiko side by side. In use the Irwin bits cut sheet metal faster, producing smoother edges (less burrs) and more well rounded holes. For rough work on a tight budget the Neiko may be a good choice. Otherwise I’d recommend the Irwin bits. When is a step drill better than a standard metal drill bit? When drilling sheet metal. You get better formed holes, less burrs, and less “grab” as the bit exits the material. As hole diameter increases these differences become even more pronounced. Less torque required. With wider diameter holes, a standard drill bit is engaging the entire diameter of the material at once. Whereas a step drill engages a fraction of that. This results in easier drilling, and less torque on one’s wrists and hands. The workpiece is also less likely to be torn out of your hand when your grip is not firm enough. When a standard drill bit is too long. Step drills are shorter than standard drill bits. For example a 1/2” (max) step drill is about half the length of comparable metal drill bit. It’s possible to de-burr holes with a step drill by just allowing the next step size to lightly touch the material before you stop drilling. It takes a bit of practice, but can save time especially when drilling a lot of holes. If you need to enlarge an existing hole, and want it well centered on the original hole. This can work nicely even in wood, when drilling with Forstner (flat bottomed) bits - the Unibit can cut a 1/8” wider “starter” hole which is just enough to keep the Forstner bit centered. Smooth cutting step drills - like this Irwin bit - cuts plastic sheet much better than regular bits, especially as hole sizes increase. I found it easy to produce clean edged, accurate holes with the Irwin step bits in my handheld drill. Trying to use standard bits often made a mess of things, unless the holes where small (say less than 1/4” diameter). A single step drill bit might save one the hassle of carrying a set of standard drill bits, but of course only when all the material you are drilling is thin enough. When is a standard metal drill bit better? When you want to make no mistake about drilling too large a hole. A regular drill bit always makes the same hole size - no need to count the steps - which can be very reassuring when drilling into a valuable workpiece. In thicker heavier material, or when you need non-through holes. Step drills just aren’t designed to do this. Other details and observations: Use step bits to quickly measure the diameter of existing holes. Just insert the bit until it’s snug and read the diameter from the it. Of course the step drill needs to have high quality markings for this to be practical. Enlarge an existing hole, while keeping the center of the hole unchanged. You can (almost) double the effective depth of cut of your step drill if you are able to drill in from both sides of a hole. I was able to produce accurate, clean holes in 3/4” thick fir plywood when I drilled it to the maximum diameter of the bit. So if you live with 1/2” holes you are not really constrained as to thickness of your wood. The bit cut quickly and cleanly through the material. Of course this is a very special case, but I thought it worth mentioning nonetheless. One review claimed that these bits cut in two directions. To test this I tried making holes in hardwood by running my drill in reverse. It worked poorly, cutting action much slower and the quality of the hole was not as good as running the bit in a normal (clockwise) direction. In hardwoods, I found step drills to be a quick and effective way to remove the ragged edges and slivers on the back sides of freshly drilled holes. You do need a light touch, and a bit of practice to obtain consistent results. If you would like to see more images of bits, test cuts, and so on, please see my review of the Irwin 10225 Unibit set. I hope you found this information useful. If so your feedback would be much appreciated.
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    Top reviews from the United States

    • Reviewed in the United States on May 24, 2025
      Size: #4 (3/16-7/8")Style: High Speed SteelVerified Purchase
      Recommend
    • Reviewed in the United States on June 8, 2015
      Size: #1 (1/8-1/2")Style: CobaltVerified Purchase
      I bought this bit as part of my tool kit to drill endpin jack holes in expensive guitars to mount the endpin jacks for internal pickups. Any drill bit will make a hole, but I wanted to make sure the wood on the guitars would be in perfect condition after the hole was drilled. Causing serious damage to a $5,000 guitar can ruin a guy's day, especially if he's the owner of the guitar. Typically, if no prior hole exists, a new 1/4" hole is drilled with a sharp brad point drill bit, followed by a precision tapered reamer from a guitar luthier supply house. However, sometimes a smaller hole already exists where a strap button was screwed in or a tapered end pin was press fit into a tapered hole. Perhaps the tapered endpin was even glued into the tapered hole and can't be removed without drilling. If a strap button had been screwed in, then the screw hole could be filled and a new hole could be drilled as if none had ever existed, followed by the precision reamer to safely bring the hole to its final dimension. On the other hand, this Irwin Unibit could be used to drill a tapered hole, using the strap button screw hole as a pilot hole, followed by the precision reamer to bring the hole to its final dimension. I have used the Unibit for this exact purpose, and it worked beautifully, with no damage to the guitar. If a tapered wooden strap button has been glued in, the button can be carefully sawed off near its base, and the hole can be drilled with a brad point bit and then reamed, just like the situation where no hole ever existed. But no sawing is needed if a punch is used in the center of the wooden end pin, a 1/8" pilot hole is drilled with a normal twist metal bit or a brad point bit, and the the Unibit is used to drill through the strap button and into the guitar. Eventually, as the Unibit goes deeper, a tapered hole is formed that is larger than the strap button, and the button is drilled completely away, leaving only a nicely tapered hole for the precision reamer to follow and finish to final dimension.

      The Unibit can be used after drilling a pilot hole, without using the precision reamer. If that is done, it is best to stop drilling with the Unibit when it reaches the 15/32" step and then finish the hole with a standard 15/32" metal twist bit that will tend to self-center. Or, the Unibit can be used to fully penetrate the guitar base and end block, leaving a 1/2" hole that is slightly oversized for most endpin jacks, but completely usable. Alternatively, buy the 12mm Unibit, which is 15/32", and the hole will be exactly the right size. The precision reamer from the well-known guitar luthier supply house is strongly recommended, but even just the Unibit will safely do a good job. Do put blue painter's tape where the hole will be drilled to help protect the wood from damage. DON'T use the cheap tapered hand reamers, including the one from Irwin -- they do not make good, concentric holes in wood. I've tried -- and failed miserably. The cobalt Unibit is not necessary. The standard (less expensive) tool steel works well, just not as long as the cobalt. For $10 more, the cobalt seems to be the better deal if it is used often.

      This is a must have tool in a guitar workshop.
      8 people found this helpful
      Report
    • Reviewed in the United States on December 8, 2024
      Size: #20 (9/16-1")Style: High Speed SteelVerified Purchase
      I had to drill 7/8” hole in 1 1/4” tubing on one side only, and so, I couldn’t use full size step drill bit for being too long. This half size bit did the trick beautifully. It’s very sharp and the hole came out very clean. I’m very happy to find this unique bit.
    • Reviewed in the United States on January 23, 2025
      Size: #20 (9/16-1")Style: High Speed SteelVerified Purchase
      Needed fo a project to enlarge a mounting hole for an axle on a lawn trailer. Worked perfectly, round hole unlike a typical twist drill bit.
    • Reviewed in the United States on April 11, 2025
      Size: #4 (3/16-7/8")Style: High Speed SteelVerified Purchase
      It works
    • Reviewed in the United States on May 30, 2022
      Size: #10 (1/2")Style: High Speed SteelVerified Purchase
      I bought this after looking at countless drill bits to find the best one for drilling out the endjack for guitar pickup install. It is a high end $3000. guitar so if I am taking a drill to it i any way, shape, or form, it needed to be the best. A fine guitar is made of fine woods and a fine finish so a drill bit which rips or tears at the finish or even leaves a scratch or rough spot at all is a deal breaker. This bit was easy to use, sharp, and made a very nice clean hole for my endpin jack install. I don't typically write reviews but wanted to write one for this bit for the benefit of other guitarists that are looking for the right drill bit for installing endpin jack for their pickup. The pickup I installed was a K&K pure mini and the guitar is my Martin CEO-7. I had never installed a pickup before and this 1/2 inch unibit worked perfectly. It will get the job done neatly. Of course, make sure you also use blue painters tape on any guitar to protect during drilling.
      3 people found this helpful
      Report
    • Reviewed in the United States on October 26, 2024
      Size: #4 (3/16-7/8")Style: CobaltVerified Purchase
      cuts through plastic like butter literally. Hopefully the coating will make it last as long as I live.
    • Reviewed in the United States on August 23, 2024
      Size: #4 (3/16-7/8")Style: High Speed SteelVerified Purchase
      Irwin has always been a great Step Drill when used as it should be with sheet metal. I have used this brand for years when I was building street rods.

    Top reviews from other countries

    • Nick D.
      5.0 out of 5 stars Cuts like a hot knife through butter!
      Reviewed in Canada on November 27, 2017
      Size: #3 (1/4-3/4")Style: High Speed SteelVerified Purchase
      Cuts like a hot knife through butter!
    • Pietro
      5.0 out of 5 stars works great!
      Reviewed in Canada on April 28, 2015
      Size: #2 (3/16-1/2")Style: CobaltVerified Purchase
      Powerfull
    • L-A
      5.0 out of 5 stars Great deal
      Reviewed in Canada on July 14, 2024
      Size: #3 (1/4-3/4")Style: CobaltVerified Purchase
      Happy with product, great deal , well built,thanks
    • Burke Kilgour
      5.0 out of 5 stars Just what i wanted
      Reviewed in Canada on December 28, 2023
      Size: #20 (9/16-1")Style: High Speed SteelVerified Purchase
      Factory sealed never opened exactly what I needed
    • Gil
      5.0 out of 5 stars Five Stars
      Reviewed in Canada on January 20, 2018
      Size: #1 (1/8-1/2")Style: CobaltVerified Purchase
      A very good quality tool.