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IRWIN Unibit 3/8-in 2 -Step Drill Bit ( 7/8-in and 1-1/8-in )

Name: IRWIN Unibit 3/8-in 2 -Step Drill Bit ( 7/8-in and 1-1/8-in )
Brand: IRWIN
SKU: 5001600747
Rating: 4.3 (48 reviews)

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4.3

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IRWIN Double-Flute Unibit® #9 Step Drill Bits are ideal for drilling holes into thin materials such as stainless steel or sheet metal and offer 2X FASTER DRILLING versus a single-flute design. The dual-flute cutting edges helps to deliver clean holes and 12 defined steps allow for quick drilling of holes 7/8-in and 1-1/8-in in diameter.

2X FASTER DRILLING SpeedPoint tip for fast starts
DRILL THROUGH A VARIETY OF MATERIALS Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates
2 Defined and marked steps allows for quick drilling of 7/8-in and 1-1/8-in in diameter (22mm to 29mm)
REDUCED SLIPPING 3 flat hex shank design helps to prevent slipping in drill chuck
2X FASTER DRILLING Average of first 10 holes versus single-flute IRWIN Unibit #9 10239 in 1008 Steel

General
Sub-Brand	Unibit	Package Quantity	1
Material	High-speed steel	Shank Type	3-flat

Dimensions
Diameters of Holes Drilled	7/8-in and 1-1/8-in	Shank Size	3/8-in
Number of Hole Sizes	2	Step Size	1/16-in

Features
Set/Individual	Individual

Compatibility
Brand/Model Compatibility	Universal

Warranty
Warranty	None

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 WARNING(S) -

Miscellaneous
UNSPSC	20121600

Check out the Best Selling Step Drill Bits on Lowes.com

Review

4.3 out of 5

48 Reviews

2 Star

74% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

The drill bit is versatile and effective at cleanly drilling holes in various materials like metal, plastic, and fiberglass. Many users praise its durability and ability to cut through tough materials. However, some report issues with its performance on thicker or harder materials, such as the bit's edge wearing down quickly or limited effectiveness beyond certain hole sizes. Overall, the drill bit appears reliable for tasks involving sheet metal, thin materials, and smaller holes, but its capabilities may be limited for more demanding drilling requirements.

Customer review summary generated by AI, including incentivized reviews.

48 Customer Reviews

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Ease of use is great.

Would Recommend

Cut right through the metal making the perfect hole needed for my project.

ButchMay 20, 2025
Verified Purchaser

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Durable

Would Recommend

I’ve used these for fabricating many Softwash systems and they’re still going strong. Highly recommend for anyone who uses these often.

ShawnApril 1, 2025
Verified Purchaser

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Great bit

Would Recommend

Very good quality

DdanFebruary 26, 2025
Verified Purchaser

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Find a better quality bit

Would Not Recommend

Price and weight persuaded me I was getting a quality product. That isn’t the case. The metal is too soft and it wears down quickly.

Kelmar97January 26, 2025
Verified Purchaser

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Response from Irwin Tools

Hello Kelmar97. I appreciate your feedback. I would like to speak to you about the experience you had with the IWAS10239DF IRWIN Unibit 3/8-in 2-Ste...

Irwin ToolsFebruary 4, 2025

Deburs as it reams!

Would Recommend

Works like a charm! It reams out the hole size you need and DEBURS it at the same time! No need to file the edges afterwards.

RonnieDecember 26, 2024
Verified Purchaser

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Flats to small

Would Not Recommend

The flats on the shank of this bit are tiny. Keeping it chucked up with drilling holes in a metal drum was an exercise in frustration. A shame for a bit that is as expensive as this one.

JeffDecember 22, 2024

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Response from Irwin Tools

Hello Jeff. Thank you for taking the time to provide your feedback. I'm sorry you weren't pleased with the IWAS10239DF IRWIN Unibit 3/8-in 2...

Irwin ToolsDecember 24, 2024

go slow

Would Recommend

Works with the same features as the smaller size .

BobbySeptember 6, 2024
Verified Purchaser

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IRWIN: Featured Videos

COMPARE PRODUCTS

		Name	Current Item IRWINUnibit 3/8-in 2 -Step Drill Bit ( 7/8-in and 1-1/8-in )
		Ratings	48
		Material	High-speed steel
		Number of Hole Sizes	2
		Diameters of Holes Drilled	7/8-in and 1-1/8-in
Klein ToolsStep Drill Bit, Quick Release, Double Spiral Flute, 7/8 to 1-1/8-Inch	Klein Tools3-Step Drill Bit, 3/8-Inch Hex, Double Straight Flute, 7/8-Inch to 1-3/8-Inch	IRWINUnibit 3 -Piece Set 12 -Step Drill Bit Set ( 3/16-in to 7/8-in )	Klein ToolsStep Drill Bit, Quick Release, Double Spiral Flute, 7/8 to 1-3/8-Inch	Klein ToolsStep Drill Bit Set, Quick-Release, Double Fluted, 3-Piece	SpyderMach-Blue 1/4-in 16 -Step Drill Bit ( 3/16-in to 1-1/8-in )	DEWALT1/4-in 2 -Step Drill Bit ( 7/8-in to 1-1/8-in )	SpyderMach-Blue 1/4-in 6 -Step Drill Bit ( 3/16-in to 1/2-in )	SpyderMach-Blue 1/4-in 9 -Step Drill Bit ( 1/4-in to 3/4-in )
56	36	38	56	21	4	13	1
High-speed steel	High-speed steel	High-speed steel	High-speed steel	Titanium Nitride coated HSS	High-speed steel	High-speed steel	High-speed steel	High-speed steel
2	3	12	3	13	16	2	6	9
7/8-in to 1-1/8-in	7/8-in to 1-3/8-in	3/16-in to 7/8-in	7/8-in to 1-3/8-in	Set	3/16-in to 1-1/8-in	7/8-in to 1-1/8-in	3/16-in to 1/2-in	1/4-in to 3/4-in