This is the Dahle Model 442 Premium Rollin Trimmer!
On the top are guides to common paper sizes and other angles.
The squares throughout measure 1 centimeter by 1 centimeter. There are inch measurements on the side, too.
And there is a convenient lip that catches the smaller trimmings.
The rolling head snaps into place on both sides of the trimmer.
When the blade passes, it pushes down on the clear paper clamp and helps secure your pages when cutting.
It comes with an edge guide to place your pages against. You can remove this as well and place it anywhere—there are magnets to help keep it in place, too. And you can use it on either side of the cutter.
Many trimmers derail when you try cutting too many pages—I overloaded this one, and it still cut through all of them! That is one of the best tests for a good trimmer, and this one passed.
Of course, it’s always recommended to cut not cut more pages than 30 sheets, and less usually produces even cleaner cuts.