Cutting wheels wear out. Grinding discs shatter. And swapping between tools mid-job? That’s just wasted time. That’s why we built the 4.5″ HDII—a diamond grinding and cutting wheel that does it all, and does it better.
With a solid steel core that won’t explode under pressure and 6 karats of industrial 46-grit diamond coating both the face and edge, this wheel cuts, grinds, sands, and shapes just about anything—steel, tile, stone, PVC, cast iron, composites, and more.
It’s our original workhorse for a reason: clean cuts, fast grinds, long life, and no tool-switching nonsense.
✅ Solid Steel Core – Won’t shatter or snap like fiberglass wheels
✅ Face + Edge Diamond Coating – For cutting, grinding, sanding, and shaping
✅ 46-Grit Industrial Diamond – Fast material removal with serious bite
✅ Works on Nearly Everything – Metal, masonry, porcelain, PVC, plastic, and more
✅ 7/8″ Arbor – Fits most standard 4.5" angle grinders
✅ Lifetime Guarantee – Wears down? Binds up? We’ll replace it. No excuses.
Already using the HDII?
Grab the Flush Cut Version for a flat grind and larger surface area!
Original tool. Same bite.
The 4.5" HDII—cut it, grind it, shape it, and sand it
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.
