After the towers were completed, two temporary catwalks were built between the two suspension towers. Then, workers began laying the bridge's four main cables, a series of thick cables that stretch between the tops of the two towers and carry what would later become the upper deck. The first strand of the first main cable was hoisted between both towers in July 1929, in a ceremony attended by the governors of both states and the mayors of New York City and Fort Lee. The two temporary catwalks allowed workers to spin the wires for the main cables on-site. The wires for the cables were spun by dozens of reels at a dock near the base of the New York anchorage; each reel contained 30 miles of wire at any given time. A total of 105,986 wires were used in the bridge when it was completed.