Features:
1. Easy to install, simple and generous.
2. The quality is very good, using ABS material (a very good kind of plastic)
3. Large, relatively large size, suitable for a lot of fat cats.
4. Four major functions:
(1) No entry and no exit (completely closed)
(2) Can go in and out (completely open)
(3) Only in but not out
(4) Only going out but not in

Size
S: 19*20*2cm/7.52*7.83*0.78in
M: 19*20*5.5cm/7.52*7.83*2.16in
L: 23.5*25*5.5cm/9.25*9.84*2.16in
XL: 25*28*5.5cm/9.84*11.02*2.16in
Note: Size S Is A Little Different From Other Sizes. It's "thinner".

Installation method:
Tools needed: electric drill, iron saw or electric saw, measuring ruler;
Step1: First use a piece of paper to draw the size of the door cover (there may be a few millimeters error);
Step2: Finish the drawing and mark it on the door, and draw the seal with a pencil;
Step3: Use a drill to drill a hole in the four corners of the painted door, and then start to dig the hole directly if there is a chainsaw;
Step4: If it is a glass door, use a glass scribing tool to gently cut it open and fix it with glass glue;
Step5: The hole is cleaned up, now first get a layer of wooden leather to wrap around the hole, for the sake of beauty;
Step6: Install the cat door, there are accessory screws, and screw them on with a screwdriver;
Step7: The screw port is also equipped with a screw cover, press it, OK.

Package:
1 * Pet Door