53 in. W x 38 in. D x 2-1/2 in. H Premium Square Flat Window Well Cover. It costs $135 at Menards. This is an extra one purchased when we had window wells installed in our basement.
Compatible with most window well shapes ranging from 50 in. to 53 in. W by 36 in. to 38 in. projection. Constructed from 1/8 in. thick polycarbonate