Steel lattice beams are scaffold bridging beams made of steel scaffold tubes. It is 450mm in depth (centre-to-centre height/distance between top and bottom), offering bridging in scaffolding for large-span required constructions, such as roofs, staging floors, and bridges. They are available in various types, dimensions, and materials, designed to meet different project requirements. Whatever the reason for your scaffolding beam needs we can assure you we have the products available! Just browse through our. Lunch atop a Skyscraper is a black-and-white photograph taken on September 20, 1932, of eleven ironworkers sitting on a steel beam of the RCA Building, 850 feet (260 meters) above the ground during the construction of Rockefeller Center in Manhattan, New York City.