The Cat Door --- for the interior door gives a hole in the door. It's a perfect solution for your cats to walk through a door without constantly keeping them open. You can place cat litter boxes in the toilet or basement to isolate odors. Keep Baby Away From Litter Box --- It is a good safety measure to close the cellar door or door, but allow cats to enter the cellar to get their litter box. It also keeps the dogs out of the bedroom, gives the kittens a place to eat and a place to escape. Safe and Secure --- The cat door, left in the door, allows the cat to enter and exit the room freely, and it is no coincidence that the cat's tail is hung or stuck by the door , protecting it effectively. At the same time, its simple cat-shaped design can complement the decorating style of your home. Large Applications --- Size 7 x 6.5 inch Cat door hole suit for most types of cats. It can be used on a hollow chamber door, a massive door and even a glass door. Close the door so the baby cannot enter the basement room and pick up kitty litter. With this cat door, cats could enter and exit freely and would not scratch the cellar door, bathroom, etc. Easy to install --- This interior pet door is shaped like a cat's head and is made of high quality thick plastic.