40 in. x 17 in. Circular Polycarbonate Window Well Cover Features virtually unbreakable clear polycarbonate: allows light in and does not obstruct your view Supports up to 100 lbs: protect your children and pets Includes easy to install spring-clip hardware: Installs in 10 minutes Keeps your well free of leaves, debris, animals, rain, snow and cold: Helps save energy Uv-stabilized plastic to stop sun damage: prevents hazing, cracking and discoloration