Pets can enter and exit freely: the screen door is equipped with magnets at the bottom and closes automatically. Two sliding locks at the bottom of the flap help you lock your dog's door and keep your pet at home when they're not there. Easy to install: The dog door is easy to install. You can install it yourself. Package includes screws and installation manual. Dimensions: inner frame (28cm x 33cm) outer frame (34cm x 44cm), choose the right height according to the size of your dog. Suitable for most large and small dogs, cats or other pets, but not for very small pets, as the Flap is too heavy to swing. Scope of application: can only be installed on an existing armored door, corridor, window or other armored window. They cannot be used for very thick wooden doors and glass doors. Material: Screen door dog cover is made of material, safe and non-toxic, safe for pets, smooth surface, wear-resistant, corrosion-resistant, easy to clean and long-lasting of life. Package contains: PET