Expandable Window Screen screens are made of aluminum frames, plastic corners, glide brackets, and fiberglass mesh. Some people prefer to use these screens only during specific seasons for aesthetic reasons, as they don't want permanent screens on their windows. These screens are easy to install and serve as temporary barriers against flying and crawling insects when the outside temperature allows for open windows. They can be used horizontally with vertically sliding windows or vertically with horizontally sliding windows, and they can adjust to fit different window sizes. Installing these screens is as simple as opening the sliding windows, placing the screens in position, and closing the windows to hold them securely in place. They provide ventilation while keeping insects out.