These hard covers are typically used in place of the manufacturer provided lid that is light gauge and not made to support any weight.  These heave bin lids are used when you are permanently fixing fill equipment to your grain bins such as grain spouts, cross augers, conveyors or grain pumps.   The fill equipment would be field fitted or attached to discharge grain through this cover.   Hard covers have a 2” lip around the circumference with 4 holes drilled for attaching to bin collar.  We offer hard covers to fit several common size bin peak openings or collars with the following inside diameters-  32” (Butler)  , 37” (various manufacturers), and 40” (Brock Bins)