CU of a steel worker operating a wire gauge machine. ECU detail of the man checking the gauge of the wire. CU of giant spools of steel wire being coiled. CU of a cooling section that the steel passes through. MS of a worker driving a trailer full of gauged steel wire. WS of hot round steel columns passing through a conveyer belt. CU detail of the column. CU of worker operating machinery. MS of the operator and the steel being processed. CU of steel being processed. WS of finished steel being carried out of the plant on a trailer truck.VO of narrator describing the process and how essential iron is to a vast network of human industries.