Shape Products window well covers feature nearly indestructible clear polycarbonate plastic with a molded back-bar for extra strength. Keeps your well free of leaves, debris, animals and the elements while protecting children and pets. The cover measures 40 in. x 17 in. and is recommended for half-circle wells from 37-40 in. wide x 15-17 in. deep, which allows a reasonable over-lap fit. Product Depth (in.) 17 Product Height (in.) 2.5 Product Length (in.) 40 Thickness (In.) 2.5 Material Plastic Weight Capacity (lb.) 100 Window Well Part Cover