Skip to content
Shop Your Local Store ● Ship to Your Hometown Store
Pro & Contractor Accounts ● Apply for Net Terms
100,000+ Products ● Trusted Authentic Brands
FAQ Shipping & Returns Order Lookup Contact Account
Irwin Unibit Assorted L High Speed Steel Step Drill Bit Set 3 pc
Irwin Unibit Assorted L High Speed Steel Step Drill Bit Set 3 pc

Irwin Unibit Assorted L High Speed Steel Step Drill Bit Set 3 pc

Made in America

Support American manufacturers + independent hardware retailers in one purchase.

One bit, multiple hole sizes—this high speed steel step drill trio cuts clean holes in sheet metal without swapping bits.
Irwin MPN 10502ZR
Sold Locally Only

This product isn’t sold on our website — see your local hardware store.

In-Store Exclusive

This one's worth the trip to the store.

This Irwin item is one you'll find in stores rather than online — and that's often the better way to buy. In store you get the genuine article, full manufacturer warranty, and real advice from someone who's actually handled it — no counterfeits, no gray-market resellers.

  • Authorized dealer network · Full manufacturer warranty & support
  • Guaranteed authentic · No counterfeits, no gray-market resellers
  • The brands set these standards · Be wary of sellers who don't follow them
Why isn't this online? The whole story →

About Product Overview

IRWIN's Unibit line has been a shop staple for drilling clean, burr-free holes in sheet metal and thin stock, and this 3-piece step drill bit set gives you a range of hole sizes without swapping between a dozen twist bits. Each bit is machined from high speed steel to hold an edge through repeated use in electrical boxes, HVAC ductwork, automotive panels, and general fabrication work. Because a single step bit cuts multiple diameters as you feed it in, you spend less time changing bits and get a cleaner, more consistent hole than you would with a standard twist bit in thin material. The set ships in clamshell packaging that keeps all three bits organized and easy to grab off a pegboard or out of a tool bag. Made in the USA, it's a practical addition for electricians, HVAC techs, and metalworkers who drill a variety of hole sizes in sheet stock regularly.

  • Material: High Speed Steel
  • Number in Package: 3 bits
  • Sub Brand: Unibit
  • Overall Length: Assorted (varies by bit)
  • Packaging Type: Clamshell
  • Country of Origin: USA

The Details Specifications

Brand Irwin
Model / MPN 10502ZR
UPC 038548105024
Weight Under 1 lb
Country of Origin USA
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab
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.

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.

What we offer
Shop Your Local Store Ship to your hometown store
Pro & Gov Accounts Net terms · tax-exempt
Ships Nationwide Direct to your door
Shop Local First Real hardware stores
$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
100% Authorized & Genuine — Our Guarantee →
Their Counter
Try local first · we'll wait

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.

Find a local store →
Mon–Fri 6–5 PST
Independent hardware retailer? Join the network → Make hardware content? Earn 6% as a creator →
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 familiar 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.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare