Size: Pet screen door outer frame: 24cm x 29cm; Inner frame: 20.5cm x 26cm; Suitable for small/medium dogs or cats. Material: Made of high quality ABS material, safe, non-toxic and durable. Give your pet an independent passage: There is a magnet at the bottom of the door frame, the pet screen door can be automatically closed once the pet passes through the door. Two sliding locks on the bottom of the flap help you lock the dog screen door, ensure your pet stays inside the house when not supervised. Easy to install: Available in screen door or screen window types; Install the pet screen door in a suitable place according to the size of your dog and secure it with screws. screws. Instructions included in the product package. Using Suggestions: Please bend the inner flap slightly when inserting it into the outer frame. And train your pet to enter/exit through the screen door.