SKU: 56226152540

IRWIN Step Drill Bit. 1/8-Inch to 1/2-Inch Step. 1/4-Inch Shank (10231)

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Description

IRWIN Step Drill Bit. 1/8-Inch to 1/2-Inch Step. 1/4-Inch Shank (10231)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.

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

Features

  • This product is easy to use

  • This product is highly durable

  • This product is manufactured in United States

  • 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.

  • 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.

  • Speed Point 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.

  • 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.

  • 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.

Specifications

Part Number : 10231

Item Weight : 1.6 ounces

Product Dimensions : 6 x 2.9 x 0.8 inches

California residents : Click here for Proposition 65 warning

Item model number : 10231

Size : 1/2 inches

Color : Silver|Silver metallic

Finish : Black Oxide

Material : High Speed Steel

Item Package Quantity : 1

Cutting Diameter : 3 inches

Tool Tip Description : 118 Degree

Measurement System : Fractional

Included Components : Power Tool Accessories. Drill Bits & Accessories. Step Drill Bits

Batteries Included? : No

Batteries Required? : No

Warranty Description : Manufacturer

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 56226152540

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4.1 ★★★★★
Based on 22 reviews
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Kris Nicholas
Los Angeles, US
★★★★★ 5
They Fixed My Boat
Size: PP67-712 V1
My boat wouldn’t start, and the outdrive wouldn’t go up or down. So I bought three of these solenoids and replaced the starter and both trim motor solenoids/relays. Now it starts right up with no problems and the trim motor is working again also. I have a 2006 Stingray boat.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 7, 2022
J
Verified Purchase
Josh T.
Charlottesville, US
★★★★★ 1
Poor quality
Size: PP67-712 V1
Poor quality. Replaced a starter solenoid on a mercruser 4.3. Right off install it would click but not make a connection to start motor. Confirmed this was the culprit by jumping the terminals. After testing multiple times found it worked a little less than half the time.
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Reviewed in the United States on May 29, 2026
B
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Bret Jackson
Cuba, US
★★★★★ 5
Best main wire for price
Size: 25 FT, Style: 0 (1/0) AWG RED
Good main wire and is accurate size and length
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Reviewed in the United States on May 18, 2026
A
Verified Purchase
Alexander Santos Espinal
Alexandria, US
★★★★★ 5
Cables buenas
Size: 25 FT, Style: 0 (1/0) AWG RED
Excelente 👌
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Reviewed in the United States on May 9, 2026
J
Verified Purchase
Joshua Garner
Chelsea, US
★★★★★ 5
Don’t hesitate
Size: 15 FT, Style: 0 (1/0) AWG RED
Tough good quality wire!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026

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