PCA?s exclusive Astragal system for double door installations allows you to open both doors leaving no obstructions in the opening. With no center post, you can easily move furniture, bulky items or simply have a larger entrance for accessing outdoor patios for entertaining. Flush Bolts located at the top and bottom of the Astragal are easy to operate and provide a quick and effective way to open and close your ?fixed? screen door. The Astragal system is made of all rust-free components. Not only do you not have to worry about maintenance, you can be assured that your French screen door will last as long as the door itself.