Unlike other metal frames common among sliding glass door panels, the vinyl frame fits comfortably in the track and matches the original vinyl of your sliding glass door. This semi-permanent pet door has a spring-loaded design, which means that no tools are necessary for installation. It safely secures the panel in place without making any permanent alterations, which is ideal for rentals. Engineered to withstand -40 degree weather and 50mph winds, the magnets that line the flap ensure the utmost energy efficiency and keep the flap sealed during rough weather.