[Wide Range of Uses] Made of high quality plastic, strong enough and not easy to fall off, you can use it for a long time and don't have to worry about your dog this large dog door for screen door. The pet screen door can be installed on screen doors, or any other places with screens [4 Entry Ways] According to the door bolts in different directions at the bottom, you can choose 4 ways of entry and exit for this large dog door : fully closed, fully open, only in and out, or only out and not in,is a great entrance and exit for your doggie and cats. Wide Range of Uses: Installable on various screen surfaces, providing a flexible solution for pet access.