---
product_id: 17200235
title: "Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic"
brand: "irwin"
price: "309 kr"
currency: DKK
in_stock: true
reviews_count: 13
category: "Irwin"
url: https://www.desertcart.dk/products/17200235-irwin-tools-irwin-step-drill-bit-1-8-inch-to
store_origin: DK
region: Denmark
---

# 3-flat hex shank prevents slipping Save time with 13 hole sizes in one bit Patented single-flute for precise, clean holes Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic

**Brand:** irwin
**Price:** 309 kr
**Availability:** ✅ In Stock

## Summary

> 🔧 Drill Smarter, Not Harder: One Bit to Rule Them All!

## Quick Answers

- **What is this?** Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic by irwin
- **How much does it cost?** 309 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/17200235-irwin-tools-irwin-step-drill-bit-1-8-inch-to)

## Best For

- irwin enthusiasts

## Why This Product

- Trusted irwin brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **SpeedPoint Tip:** Faster penetration and zero walking for flawless starts on any thin material—get the job done right, fast.
- • **One Bit, 13 Sizes:** Drill holes from 1/8" to 1/2" in 1/32" increments without swapping bits—efficiency unlocked.
- • **Slip-Free Hex Shank:** 3-flat hex shank locks firmly in your drill chuck—no slips, no interruptions, just pure control.
- • **Precision Cutting Edge:** Patented single-flute design ensures smooth, true round holes every time—professional finish guaranteed.
- • **Versatile Material Master:** Perfect for stainless steel, aluminum, brass, plastic, and laminates—your all-in-one thin material solution.

## Overview

The Irwin Tools IRWIN Step Drill Bit 10231 is a high-speed steel, single-flute step drill bit with 13 hole sizes ranging from 1/8" to 1/2" in 1/32" increments. Featuring a patented cutting edge and SpeedPoint tip, it delivers precise, clean holes in thin materials like metal and plastic. Its 3-flat hex shank ensures slip-free operation, making it an essential time-saving tool for professionals and DIYers alike.

## Description

Product Description 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

Review: Great buy - Wonderful bit. It cut through my 2mm aluminum bracket quite easily. Haven't tested on other metals but seems sharp and durable.
Review: easier than a spade bit - Cuts clean & easy

## Features

- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00004THYX |
| Best Sellers Rank | #35,633 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #58 in Step Drill Bits |
| Brand | IRWIN |
| Cutting Angle String | 118 Degrees |
| Cutting Diameter | 12.7 Millimeters |
| Date First Available | April 1, 2004 |
| Department | Unisex-Adult |
| Finish Type | Black Oxide |
| Global Trade Identification Number | 00038548101019 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.44 ounces |
| Item dimensions L x W x H | 6 x 2.87 x 0.75 inches |
| Item model number | 10231 |
| Manufacturer | IRWIN |
| Material | High Speed Steel (HSS) |
| Number of Flutes | 1 |
| Number of Pieces | 1 |
| Point Style | Step Point |
| Product Dimensions | 6 x 2.87 x 0.75 inches |
| Set Name | 1/8" to 1/2" 13 SZ |
| Shank Type | Hex 3-flat |
| Surface Recommendation | Aluminum,Brass,Copper,Metal,Plastic,Stainless Steel,Steel |
| Tool Flute Type | Spiral |
| UPC | 787721839125 780541552908 038548101019 |
| Unit Count | 1.0 Count |

## Product Details

- **Cutting Angle String:** 118 Degrees
- **Cutting Diameter:** 12.7 Millimeters
- **Finish Type:** Black Oxide
- **Material:** High Speed Steel (HSS)
- **Shank Type:** Hex 3-flat

## Images

![Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic - Image 1](https://m.media-amazon.com/images/I/31j-8+rg62L.jpg)
![Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic - Image 2](https://m.media-amazon.com/images/I/41C84+OExeL.jpg)
![Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic - Image 3](https://m.media-amazon.com/images/I/41ktrsM7kKL.jpg)
![Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic - Image 4](https://m.media-amazon.com/images/I/711YN8A8+XL.jpg)
![Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic - Image 5](https://m.media-amazon.com/images/I/81qsrhOBO1L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great buy
*by A***V on November 21, 2025*

Wonderful bit. It cut through my 2mm aluminum bracket quite easily. Haven't tested on other metals but seems sharp and durable.

### ⭐⭐⭐⭐⭐ easier than a spade bit
*by R***T on October 31, 2025*

Cuts clean & easy

### ⭐⭐⭐⭐⭐ You get quality and service life
*by R***B on March 1, 2016*

This is the 3rd Unibit of this size in the last 10 years that I have owned, it is not that it is poorly made, its just that I keep using them. This is the only bit that I have found that I can cut gasket foil, if I do not have a punch that size (requires some trickery). It has many, many uses and I keep finding new ones. I have tried other brands but in this style, of the major brands, this last the longest of the non-impact tapered bits. I have run it at 7,500 rpm without incident and as slow as 2 rpm on 1/8" titanium sheet (prepunched starter hole). The Unibits may seem expensive when compared to HF or other cheap brands but with these you get quality and service life.

## Frequently Bought Together

- Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic
- Irwin Tools IRWIN Step Drill Bit, 3/16-Inch to 7/8-Inch, 3/8-Inch Shank (10234)
- Jerax tools 1/4 to 1-3/8 Inch Step Drill Bit Straight Grooved Double Fluted, M2 High Speed Steel Drill bits for Hole Drilling in Stainless Steel, Copper, Aluminum, Wood, Plastic

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-01-27*