Make your life easier: If you want to gives your dog independence and keep bugs out in the meantime, this dog screen door will be the best solution. Lockable & close automatically: 2 locks on the door flap allows you to close the door completely when you want pets stay at home. Magnet on the flap make the pet door can automatic close quickly after going through. Material: Made of strong plastic, sturdy and will not be deformed even in the sun. Stainless steel screws are included in the package, makes the cat door stay stable on your screen door. Easy to install: Just need a knife to cut the screen and a screwdriver to install the screw, installing this dog door with two people will make the installation easier. Screens are not included, you can use the screen you cut out of your own door. Size: Outer frame: 17.5” * 13.4”, inner door flap: 14.4" * 11.2”, the thickness of pet door: 0.67”, suitable for sliding door, screen door, window and other screen areas. If you want to give your dog independence and keep bugs out in the meantime, this dog screen door will be the best solution.