These are trapozoidal shaped screen ports that hinge at the top and open to allow access to my window handles. These are used in an urban residential application so I'm not sure if they are commercial windows or now but I think they might be. The hinge pins seem to break off easily. They are plastic and just shy of 10" across the bottom. They look rectangular in the photo but they are trapozoid. They are narrower at the top (hinge side) than the bottom. Have you got these ?