389010U Insulation Knife FGK,orange

This is a great knife for insulation, for bread, or light machete work. It comes with an edge protector. It is thin, so no wood chopping. And the blade is 11.8 inches long, not two inches, as the info says.

Made working with foam insulation and batting a breeze

I have only given this knife a quick test, but it is very sharp and cut very well. It is super thin which will help cut thru the foam I plan to use it for (High density and styro foam) we will see how long it will stay sharp.

I recently bought the Hultafors 389010U Insulation Knife specifically to install Rockwool batts throughout my home during a major insulation upgrade. This knife? It's on another level. The serrated blade glides through Rockwool insulation almost too easily—yes, it really does feel like a hot knife through butter. No more sawing back and forth or compressing the batt to force a cut; just steady, smooth pulls and the material parts cleanly with minimal dust and perfect edges. The blade length (which looked intimidating at first) is actually ideal—it lets you slice straight through the full thickness of standard 5.5" or even thicker batts in one or two passes without having to flip the piece or make multiple shallow cuts. The handle is comfortable and grippy, even when things get dusty, and the overall build feels solid and well-balanced for repetitive cuts. It's clearly designed by people who actually work with insulation, not just a generic "big knife." After finishing several rooms, the blade still looks sharp and ready for more—no noticeable dulling on Rockwool, which is notoriously abrasive. If you're planning to install mineral wool/Rockwool, or any fibrous insulation and want clean, fast, frustration-free cuts, this Hultafors is worth every penny. It's a specialized tool that does exactly what it's made for—and does it exceptionally well. Highly recommend; I won't go back to anything else for insulation work.

Excellent knife used for rock wool insulation

I love this things, made my insulation project a breeze!

Unbelievably effective on mineral wool or rockwool. I had 16 x 8.5" bats and it allowed me to cut them to perfect size, cutouts, ext... with ease.

Cutting insulation made easy

I use this knife to cut insulation MF or tank wrap. It cuts like you're water. It's very sharp 👌. I recommend to most insulators to have this knife 🔪

I knew how big this was going to be but it still surprised me. Great knife for insulation. Love it!

Le couteau ne me convenais par part rapport a mon metier et utilisation.J'ai donc retourné l'article mais je ne comprend pas pk j'ai eu des frais de retour...Pour cela je donne pas pkus que 3*

Je l’utilise pour couper de la laine Rockboard sur les chantiers. Coupe extrêmement bien!! Très léger, et ergonomie. Seul bémol, il est très gros, difficile de le mettre sur notre ceinturon

Why fumble with ax exacto knife when you can use this?