A Plexidor performance pet door can be installed in any type of house door. The doors have locks, and separate metal security plates that are easily screwed to the interior frame completely cover the opening. The door itself can only be unscrewed and removed from the inside. The see-through, rugged panels allow your pet see exactly where they are going when entering or exiting and are built to last. The panels swing smoothly and quietly both ways, so it won’t disturb you while you relazing or at rest. The heavy duty frame with an industrial-grade weathers-seal design ensures that your pet door will resist the warping and rust that often results from exposure to the elements that other pet doors don’t account for. The air tight design keeps out wind, rain and bugs – and the vertical setup of the doors makes it less likely that small wildlife would enter. The finish has been baked on, so it will not fade and will continue match your decor today, tomorrow and years from now.