The Bilco ScapeWEL Polycarbonate Dome Cover is a two or three tier cover, depending on width, for the Bilco ScapeWEL.The UV-resistant covers help limit snow, leaves, or debris from entering the home. The ScapeWEL Dome Cover includes 6 flexible metal clips with six 1/2" screws. Indents for the clip and screws are molded at the outside of each panel. Please Note: When using a dome cover with a casement window, the window well must be installed so that it is higher than the top of the window so that the cover will not interfere with the window operation. Also, any modifications or incorrect installation of the cover could compromise the integrity of the cover and void the warranty. WW4054-C - Width: 63in. Length: 42in. Height: 12in. Depth: 42in. Thickness: 0.1in. Weight Capacity: 200 lbs. Product Weight: 31 lbs.