I needed the small cat door to go on my screen door to porch. The screen door has a 15 inch metal plate below the screen. The plate is 1/32 in thick. It took me a half day to take off about 5/8 in of the telescoping pieces so when put together the front and back would touch. I sanded the edges down smooth. I through drilled the screw holes into the back plate and tapped for 6/32 screws, used 1/2 in screws. The job turned out great...looks great. It can be done using care.

although assembling is a minor inconvenience I am pleased so far with the appearance. During assembly I anticipated possible future tape/screw failure and applied a small bead of super glue to the door frame and both parts of the cat door. It is currently placed on a door in my basement to give my two cats access to their litter boxes and to keep my 6 month old pug puppy away from their litter pans. (He has a disgusting and annoying habbit) The dimensions are perfect for my stated purpose of allowing my cats in and keeping the puppy out as he is too large to fit through now and even looks nice. I am thinking about adding another door to allow more access and also to another area for feeding and found the enclosed cutting emplate extremely helpful in getting a headstart on the other door(s). I am happy with the performance and the look and would definitely recommend it to other people with similar dilemmas but would also advise them to ensure they have the requisite hand and power tools and to carefully measure their cat before purchasing. If the assembly was a little more streamlined and required less time i would have awarded 5 stars.

We bought this for our fairly large orange cat. We knew it might not work, since he is quite large (18 lbs, and not super chubby. This was the biggest locking one we could find on the site. It is very good quality, and works great, it is just a fair bit too small for our cat.

I installed this in the base of a outside porch screen door. 2 cats using it steadily x 2 yrs., with some rough treatment ( blasting through at a full run).
Works fine. Pain to get installed, but once frame is adjusted, works fine. Failure point is stress fractures in the plastic swing door at the swing arms. They have lasted about 2-3 yrs of heavy use before breaking up. Opening problems are from poor fitting during installation, not the product. I'm buying a replacement door right now.

This is the second one I've had. I didn't want to cut a new hole in the door so I got the same kind. The first one was sticky and hard to lock and unlock, but it lasted 2 years. Finally the slider just broke.
The new one i bought slides too easily and the cat can yank on it and change the setting. One night it pulled it into the position where it let you in but not back in.
The cats were both out all night and a different cat came in and was trapped.
Now I put a case of cat litter in front of the door each night to secure it.

I have 3 of these 2 way locking doors for my 7 cats. Though they are extremely handy, the locks are flimsy. Two of the locks are non functioning. One completely fell off while the other one kept locking my cats outside, without my touching it. I rarely ever use the lock function on any of the cat doors. I finally had to tape it shut so my cats wouldn’t continue to be locked out. One of the plastic door flaps cracked after 2 years. The 3rd door has just been installed but only because I haven’t needed to utilize the locks. However, we are moving in a few weeks so I will probably try to locate a sturdier door since I will need to start utilizing the locks.

The flap on this thing sticks and does not work very well. It's difficult for the cats to push open and then once open it sticks in that position making it hard to return the other way. Also, the round footprint makes it difficult to cut the appropriate hole in the door.

Cats figured out how to force it open when locked the second day I had it installed.

This product does not appear to be for exterior walls. It is too shallow.