Galvanized Steel Solid 4 Shelf Add On Unit - 21 x 24 x 86 in. Solid shelves are a solution where dirt, dust and spills are a potential issue. The solid flat surface allows for storage from small to large items and the marine edge perimeter prevents spillage. The double hemmed steel gives the solid shelf excellent strength characteristics. features. Product type - Solid add on unit. No of shelf - 4 shelf. Add-on units consist of 4 shelves, 2 posts and 8 shelf clamps. Finish - Galvanized steel. Outer Dimension - 21 x 24 x 86 in. Load - 600 lbs.