Cats and dogs are free to go in and out, white M: Outer door frame size: 19 * 19.7 * 5.3cm Interior door frame size 16 * 15.7cm installation method: Tools needed: electric drill, iron saw or electric saw, measuring ruler; Step 1: First draw the size of the door cover with a piece of paper (there may be an error of a few millimeters); Step 2: make the drawing and mark it on the door, and draw the seal with a pencil; Step 3: Use a drill to drill a hole in the four corners of the painted door, then start digging the hole directly if there is a chainsaw Step 4: If it is a glass door, use a glass cutting tool to gently open it and secure it with glass glue. Step 5: The hole is cleaned, now first get a layer of wood leather to wrap around the hole, for the sake of beauty; Step 6: install the cat flap, there are accessory screws, use a screwdriver to screw; Step 7: The screw port is also equipped with a screw cover, press it and OK is done! Four main functions: 1. No entry and no exit
