Fingertip adjustment to fit all sash windows. Coated metal screen resists tear, weather, and keeps flying bugs out. Durable construction painted metal rails and varnished wood ends. Extra sturdy tenoned corners double nailed keep screens square. Install metal rail screens from inside. No. AWS1037: 10'' high, 21'' to 37'' adjustable width No. AWS1533: 15'' high, 19'' to 33'' adjustable width No. AWS1537: 15'' high, 21'' to 37'' adjustable width No. AWS1545: 15'' high, 25'' to 45'' adjustable width No. AWS1837: 18'' high, 21'' to 37'' adjustable width No. AWS2437: 24'' high, 21'' to 37'' adjustable width