Structural I-Beam cantilever rack is a multi-level high density storage system designed to handle long length materials. It is the most efficient and affordable way to store lumber, engineered wood products, re-bar, metal roofing, pipe, etc. Sunbelt's I-Beam Cantilever can be used indoors or out, so it is extremely rugged. Plus, it's economical and versatile, whether it's used as stand alone storage unit, or used to support the roof of a shed or building.