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

Irwin 4-1/8 L High Speed Steel Letter F Drill Bit Straight Shank

Precision letter F sizing in durable high speed steel, ground for exact-fit holes with a standard straight shank.
Irwin MPN 81306Z In Stock & Ready to Ship
$8.59
Free shipping on orders over $75
Ships within 24 hours · most orders arrive in about 2 business days

About Product Overview

This IRWIN letter-size drill bit is ground to the exact F letter gauge, giving you the precision that fractional bits can't match when you're drilling for tap sizes or matching an existing hole spec. Made from high speed steel, it holds an edge through repeated use in metal, wood, and plastic, and the straight shank fits standard chucks without any special holder. At 4-1/8 inches overall, it's sized for everyday drill press and hand drill work in the shop.

  • Material: High Speed Steel
  • Style: Letter F
  • Shank Type: Straight Shank
  • Overall Length: 4-1/8 inches
  • Number in Package: 1

The Details Specifications

Brand Irwin
Model / MPN 81306Z
UPC 885911959643
Weight Under 1 lb
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab
Price check

Go ahead. Check.

You're going to price-check us against Amazon, Home Depot, and Lowe's. Everybody does. Good — open all three tabs. We'll wait. Then look hard at what you're actually being handed over there.

On Amazon, start with these four questions before you click buy.

01

Who's actually selling it

The brand name is on the listing. A different company is in the seller field. Those aren't the same thing, and the second one is who you're buying from.

02

Whether the warranty survives

Most manufacturers only honor a warranty when the unit came through an authorized dealer. We're authorized for Irwin. A third-party marketplace seller usually isn't.

03

Where the box came from

Gray-market stock, returns repackaged as new, and outright fakes move through marketplaces constantly. It all looks identical in the photo. It stops looking identical when it fails.

04

Who you call when it breaks

Ours is a phone number with a person behind it who has held this product. M–F, 6 AM – 5 PM Pacific. (866) 469-8556

The big boxes don't care if your hardware store survives.

Amazon, Home Depot, and Lowe's are built to pull every hardware dollar out of your town. When the local shop can't keep the lights on, the counter where somebody actually knew which part you needed goes with it. We're built the other way: real brands so you're never stuck on a marketplace, and a straight answer to buy it down the street when that's the better call. Support independent hardware — it doesn't restock itself.

Why we tell you to shop local
Authorized dealer · Irwin

Or skip the tabs entirely and buy it down the street. Find a store near you →

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.

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