This is the Dahle 556 Professional 37 1/2 inch Rolling Trimmer!
When the blade passes over the paper clamp it helps keep your pages in place when cutting.
There is an adjustable edge guide as well to align your pages with. It can also be move to anywhere on the cutter surface since it’s magnetic.
And the blade head can cut from both the left and the right.
There are guides for common angles in the center, and even several lengths of common paper sizes.
It’s important to mention, that if you try trimming too many pages, it just won’t work. The blade will roll right over them without cutting. This should be used as a precision cutter with only a few pages.
If working with larger formats, there are hooks so you can hang a roll and keep your work together.
With the stand, cutting larger banners is made easy. And all the trimmings fall below to be cleaned when it’s convenient. You can buy it with the stand, or separate.