Bad Dog 1.25″ HDII – Big Power. Small Footprint.
The 1.25″ Bad Dog HDII is the same cut, sand, and grind workhorse you expect—just sized to fit in places your bigger wheels can’t. Built for tight spots, detail work, and rotary tools, it gives you all the functionality of the HDII in a compact, high-performance form.
Coated in 46 grit diamond on both the face and edge, the 1.25" HDII tackles almost any material with confidence—metal, masonry, porcelain, tile, PVC, wood, plastic, and more. Whether you’re shaping, smoothing, or slicing, this wheel keeps working without skipping a beat.
The solid steel core gives it unmatched strength and won’t shatter like fiberglass wheels, so you can cut with confidence. And like all Bad Dog HDIIs, it's covered by our Lifetime Guarantee: wear it out or damage it, and we’ll replace it.
Designed with a 1/8″ arbor hole, it fits most standard rotary tools, including popular models from Dremel™ and Rotosaw™. It’s the ideal upgrade when you need precision without sacrificing durability.
✅ Compact 1.25″ Diameter – Perfect for tight spaces and fine-detail work
✅ Cut, Sand & Grind – All-in-one performance across multiple materials
✅ 46 Grit Diamond Coating – Long-lasting and aggressive
✅ Diamond on Face & Edge – Versatility for any angle
✅ Steel Core = Safety – No cracking or exploding under pressure
✅ 1/8″ Arbor Hole – Fits rotary tools like Dremel™ and Rotosaw™
✅ Lifetime Guarantee – If it fails, we replace it. Period.
Note: Designed for use with rotary tools. Power 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.
