Carlson Extra-High Grid with Small Animal Door

Unlike the previous reviewers, I am very satisfied. The doors can be installed even without the "cups"—you just screw in the screws with rubber ends directly into the door frame, and that's it. They work perfectly for me.

The door doesn’t fit and the extension doesn’t work.

I am really upset about this product. On the Zooplus website, it says: "Pressure-mounted: simple pressure fixing, no drilling required." That's not true: you don't have to drill into the door itself, but you do have to drill into the wall or the door frame to install the "cups" (some kind of supports) that the gate attaches to. Without these, it can't stay up. This is not what I asked for. So I can't use it at all.