This 18"L x 12 1/2"W x 8 1/2"H steel stacking rack has a patented interlocking system so that no tools or fasteners are needed to assemble a complete bin or box storage system. Weight capacities are limited only by the individual bin or box capacity, making your stacking rack system truly versatile. Accepts 18" x 12" x 8" stacking bins and boxes. Finish is baked enamel in choice of gray, blue, beige, black or green.