Sunbelt Rack Structural Steel I-Beam Cantilever Rack is the building block for many of Sunbelt Rack's T and L-Sheds, as well as our Drive Thru Buildings, but it can also be used as a stand alone storage system. Sunbelt Rack cantilever 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 Rack'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.