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, which is safe, non-toxic and durable. Give your pet independent passage: there is a magnet at the bottom of the door frame, the pet screen door can be automatically closed once the pet has passed through the door. Two sliding latches on the bottom of the flap help you lock the dog screen door, ensure your pet stays inside the house when unattended. Easy to install: Available in kinds of screen door or screen windows; Install the pet screen door in a suitable place according to your dog's size and fix it with screws. Instructions included in the product packaging. Using Suggestions: Please bend the inner flap slightly when inserting it into the outer frame. And teach your pet to enter/exit through the screen door.