The PetSafe Plastic Pet door is a utility rated pet door that is ideal for a variety of installation applications, including traditional doors, storm doors and porches. Thus door consists of an interior and exterior frame that is constructed with plastic. This frame is not considered a strong or rigid frame. The grade of plastic used is relatively inexpensive. The plastic pet door comes with a plastic panel that fits over the top of the frame, front load. This pet opening cover is very thin plastic as well and does not lock. The Plastic Door will not self-frame the cut through the door. There are vinyl 'strips' included that must be cut on site to line the rough cut portion of the door.