high pressure metal cylinders, metal tanks, metal cryogenic containers, pipe couplings, flanges, pipe nipples, insulating unions, pipe fittings, metal adapters for plastic pipes, manually operated metal valves, fittings, and scaffolding, metal brackets, couplers, fittings, guard rails for scaffolding, shoring, metal forms, metal wire, metal structural composites, steel and aluminum grating, decking, expanded metal and safety surface flooring