Armor Flex patio pet doors are the most secure and most energy efficient pet doors for sliding glass door installation. These super high-quality units are constructed with a heavy-duty, all aluminum frame, double pane, Low-E glass and all stainless steel hardware. They come with a universal lock that mates with any sliding glass door. These beautiful pet doors install in just minutes in virtually any sliding glass door frame. They are available in regular and extra tall heights and come pre-assembled with the best pet doors made. The innovative Armor Flex pet door provides the highest level of security and pet safety with air-tight, extreme weather tight seals to protect against the harshest weather conditions and provide the best energy efficiency of any pet door made. Manufactured by High Tech Pet, the world leader in ingenious pet products.