Cat Dog Door Flap Extra with 4 Way Locking Security Weatherproof Pet Kit for Kitten Puppy Safety

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