Sold as one unit. (1 unit = 12 each.) Keeps out all insects. Charcoal steel screen wire. Double nailed tenoned corners keep screen square. Heavy duty metal rail construction. Easy finger tip adjustment. Can be used as a replacement screen. Extends to fit window width. Easy to install, no tools required. 24 in Tall. Extends from 22 in To 37 in wide . Manufacturer number: GS2437. SKU #: 51336. Country of origin: (TBA). Distributed by Howard Berger Co the.