It’s unfortunate they don’t have these sheets for 4-ring binders. I have so many 4-ring binders at home, but 3 none. When I first started collecting PSA-graded cards I also bought those sheets realizing on arrival they were for 3-rings only… 
At the time I was a bit of a cheapskate, so this is how my graded binder now looks like. (Regular A4 sheets, with the (cut) 3-ring 4-slots upside down in them with paper clips, rofl.) They’re better protected I guess, but it looks so bad…
I’m gonna buy a 3-ring binder and some new sheets later today, haha. When I only had a couple of PSA-graded cards this above was fine, but since I have a few more now, it is actually pretty inconvenient to use and looks ugly… Although I would have preferred if these sheets were available as 4-rings as well, or at least supported 3, 4, and some other N-ring binders at the same time, like the 9-slot sheets I have do.
Greetz,
Quuador