|Item Weight||2.4 ounces|
|Product Dimensions||6 x 2.8 x 1.2 inches|
|Item model number||10233|
|Style||High Speed Steel|
|Item Package Quantity||1|
|Cutting Diameter||3 inches|
|National Stock Number||5133-01-146-4578|
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Irwin Tools Unibit #3 1/4-Inch to 3/4-Inch Step-Drill Bit, 3/8-Inch Shank (10233)
|Price:||$22.70 & FREE Shipping|
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- This product is easy to use
- This product is highly durable
- This product is manufactured in China
- Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates
- Single-flute cutting edge for greater control through steps
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CHOKING HAZARD -- Small parts. Not for children under 3 yrs.
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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 #3, 1/4"-3/4", (9 Steps)
Multiple Hole Sizes, 1 Bit
The IRWIN UNIBIT Step Drill Bit gives you maximum drill control to make up to 9 hole sizes with the same bit in 1/16” steps, from 1/4" to 3/4", while the single flute design creates precise, clean holes.
- SpeedPoint tip for fast starts
- Single fluting cutting edge drills clean, true holes
- Durable, high-speed steel
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, plexiglass, laminate, and more.
Step Drills for Every Application
For every trade, application, and material, IRWIN provides the long-lasting accuracy and durability you need.
High speed steel bit with single flute cutting edge for greater control through steps; hex shank prevents slipping in drill chuck. SpeedPoint tip penetrates faster and prevents walking in applications such as drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates.
From the Manufacturer
UNIBIT 3 9 Hole Sizes (1/4"-3/4"), 1/16" Increments
Top customer reviews
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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.
A quick summary:
Irwin tools are dependable and are of very good quality. I know I can get the job done if I'm using an Irwin tool or bit.
My last Unibit was used to drill 120 nickel sized holes into stainless steel plating. (about 1/8" thick) (used a drill press). I was in a hurry and didn't use any drilling oil. The Irwin survived that task but reached its limitation which was more than I expected.
I bought this particular Irwin 10234CB to drill a 13/16" hole into my Weber 10020 Smokey Joe Silver Charcoal Grill, Black. I wanted to install a 3" River Country (RC-T3W) Adjustable Professional BBQ, Grill, Smoker Thermometer (50 to 550F) (see my photo on product page) and this Unibit did the job effortlessly. (ate through that lid like it was plastic)
Irwin Unibits are pretty expensive compared to other brands, but if you want the very best and longevity, definitely get Irwin cobalt bits.
*** Don't forget to use drilling oil (or any oil for that matter, even olive oil) to extend the life of your bits.
They are also good for drilling plastic if the need arises. This Unibit has stayed sharp and true for my home usage requirements. I've used it manufacturing gym equipment at home and for making existing holes bigger. I give this product 5 stars.
Most recent customer reviews
Saves changing out bit sizes for those who drill out to final hole circumference incrementally.
This bit cut great even with a cordless drill.Read more