Window well cover fits over window wells of 40" or less in length and projecting 16" or less from house. Improves basement insulation. Keeps out rain, snow, and debris. Use a bubble cover when the window extends above the area wall. Reversible to fit circular or rectangular wells. 44" L. x 19" D. x 15" H. May be used with area wall model No. RR3716-12 (SKU 101035), No. RR3716-18 (SKU 101044), and No. RR3716-24 (SKU 101053). 10 year warranty.