The "Ultra Protect" 58 in. x 26 in. Rectangular Polycarbonate Window Well Cover has aluminum supports for up to 250 lbs. of weight-bearing capacity. It is compatible with steel, plastic, brick or concrete area walls and can be trimmed to fit smaller openings. It locks and unlocks conveniently from the inside of the house with a solid steel locking system and pull-pin release. It is made of extremely durable GE Lexan and comes with an aluminum rear support, 2 additional brace bars and installation hardware included for your convenience.