Frost King Adjustable Metal Rail Screen, 21-37 in. an and practical solution for keeping insects out while allowing better ventilation and natural light flow into your home. This versatile window screen easily expands to fit a variety of window sizes, measuring 18 inches in height and adjustable from 21 to 37 inches in width. Its tool- installation makes it quick and simple to put in place and just as easy to remove when needed. Available in multiple height and width configurations, it ensures a fit for your windows without the need for custom screens. Model Number: