The PetSafe Screen Storm Door Pet Door can be installed easily in screen doors, sliding screens and even window screens in just a few minutes. For pets up to 30 pounds. The rugged high impact polypropylene frame simply snaps together! Has a locking 7.9W x 9.25H inches swinging door with ceramic magnetic closure. Works with fiber or metal screens. Great for patio screen to pass-through. Rustproof.