"Give your pets more access to your home and the outdoors. With no cutting required, the PetSafe Freedom Patio Panel Sliding Glass Pet Door is easy to install. The patio panel inserts into your sliding glass door frame and automatically adjusts to heights between 76 3/4"" and 81"" on standard patio doors. The Patio Panel Sliding Glass Pet Door features a heavy-duty aluminum frame, weather stripping, tempered safety glass, and a replaceable magnetic flap. A closing panel allows you to restrict your pet's use and keeps the pet door closed when it is not in use. The Patio Panel Sliding Glass Door also features a reversible lock for right and left opening patio doors."