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Irwin Unibit 6 in. L High Speed Steel Step Drill Bit Square Shank

Irwin Unibit 6 in. L High Speed Steel Step Drill Bit Square Shank

Made in America

Support American manufacturers + independent hardware retailers in one purchase.

One bit, multiple hole sizes - high speed steel construction handles sheet metal and thin stock without switching tools.
Irwin MPN 10220 In Stock & Ready to Ship
Local Price Check i Local stores may price this as low as $53.99. Our online price is $59.99.
$59.99
Includes free shipping on orders over $75 · $8.99 standard below
Delivery in as little as 1–4 business days Order within — for same-day shipping
Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

About Product Overview

The Unibit #20 from IRWIN is a step drill bit built to handle multiple hole sizes without switching tools mid-job. Made from high speed steel, it's designed for drilling through sheet metal, plastic, and other thin materials where a standard twist bit would grab or tear the edges. The stepped design lets you drill a pilot hole and then open it up to larger diameters in stages, all with one bit chucked in the drill.

The 7/16-inch square shank fits standard drill chucks securely and resists slipping under torque, which matters when you're working through metal. At 6 inches overall, it gives you enough reach for most electrical, HVAC, and fabrication tasks. It ships carded as a single bit, made in the USA, so it's easy to keep as a dedicated tool in a truck box or shop drawer.

  • Material: High Speed Steel
  • Product Type: Step Drill Bit
  • Shank Type: Square Shank, 7/16 inch diameter
  • Overall Length: 6 inches
  • Package: 1 bit, carded
  • Made in USA

The Details Specifications

Brand Irwin
UPC 038548102207
Case Pack Quantity 5 per case
Retail Unit Quantity 1
Dimensions (L × W × H) 1 × 3 × 6
Weight 0 lbs
Country of Origin USA
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab

Ask our counter. Or theirs.

Most hardware stores can do more than you think. If we can't help you, the folks down the street probably can — just ask at the counter.

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$0.68 of every dollar spent at a local independent business stays in the community. At a national chain, it's about fifteen cents. Civic Economics, multi-city retail studies
Their Counter
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The stores we send you to are local and independently run — often for generations, the kind of place where someone behind the counter knows the regulars. We don't own them. We just think they deserve the foot traffic. They can put most of what we sell on their next truck. Ask there before you check out here.

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About our directory. National Hardware Group is an independent retailer and directory. The local stores we list and link to are separately owned and operated — we have no ownership stake in any of them, and most pay us nothing to be included. That includes plenty of stores flying a co-op banner that people don't realize are locally owned and run, not operated by a corporation. Store owners can choose to upgrade their listing for an enhanced presence or pickup features, but the base directory is free, and inclusion is never a paid endorsement.

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