Bad Dog 4″ HDII – The Hard-to-Find Size That Does It All
We know 4" grinding wheels are getting harder to find—but this one’s worth the hunt. The Bad Dog 4″ HDII is the all-in-one cutting, sanding, and grinding solution for folks running smaller angle grinders. Built with diamond grit on both the face and edge, it gives you maximum versatility without the need to change wheels mid-job.
Whether you're working with masonry, metal, porcelain tile, PVC, wood, or composite materials, the 4" HDII powers through it all. And because it’s built on a solid steel core, it won’t explode like fiberglass wheels if it binds up—so you can cut with confidence.
Perfect for tight quarters or specialty grinders that require 4" wheels, this HDII is available with a 5/8" arbor specifically sized for most 4" angle grinders.
As with all HDII wheels, it’s backed by our Bad Dog Lifetime Guarantee—if you wear it out or damage it, we’ll replace it. No questions. No excuses.
✅ True All-In-One Wheel – Cut, sand, and grind with one tool
✅ Diamond-Coated Face & Edge – Ultimate versatility for any cut angle
✅ Works on Nearly Any Material – Metal, masonry, PVC, tile, wood, and more
✅ Steel Core = Safer – No shattering or exploding under load
✅ Hard-to-Find 4" Size – Ideal for compact angle grinders
✅ 5/8" Arbor – Designed to fit most 4" grinders
✅ Lifetime Guarantee – Damage it or wear it out? We replace it.
Note: Use with an angle grinder. Tool not included.
Absolutely. The industry standard for grinders is as follows: Rotary Tools (i.e. Dremel TM) - 1/8" 3" Cut off tools and Die Grinder - 1/4" & 3/8” 4" Angle Grinder - 5/8" 4-1/2", 5”, 6", 7" Angle Grinder - 7/8" arbor flange for a 5/8" coarse arbor shaft At Bad Dog, we find that an HDII with a 7/8" arbor flange runs truest because it is a more precise fit. The 4-1/2" and 6" Flange wheel use the 5/8" Coarse thread which is standard on ALL grinders. Call us at 800.252.1330 if you have any questions.
Wood: It will shape wood well but burns when cutting. Glass: The HDII is too aggressive and leaves a jagged edge.
Nothing lasts forever but we Guarantee the HDII for LIFE! If you ever dull or damage your HDII return it to us and we will repair or replace it. For full details see our Lifetime Guarantee page.
We'll replace it - even if it's your fault! Here's a link to the details of our Lifetime Guarantee.
Sometimes when cutting softer metals like aluminum the HDII will "gum" up. If this happens to you, simply run your HDII through a concrete block and it will be as good as new.
As safe as they get! Cut-off wheels can be some of the most dangerous tools in a shop. We are not telling you that you don’t need to be wearing safety when using our wheel, however, the 46 diamond grit is embedded on a hard steel plate to ensure that the wheel will not fly apart on you.
Dull or damage our tools and we will repair or replace them.
Economical Flat Rate Shipping for orders under $50 in the USA. Some exclusions apply.
Don’t love your Bad Dog Tools? Return them in 60 days for your money back.
