Product details:

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 58 in. x 38 in. and is recommended for heavy-arch wells 55-58 in. wide x 36-38 in. deep, which allows a reasonable over-lap fit.