When you buy your garage door cable by the reel, you can't beat our discount prices at North Shore Commercial Door. This 500-ft. reel of galvanized steel cable is a 7 x 7 design with seven strands and seven wires per strand for durability and flexibility, whether you're replacing cables on residential or commercial garage door drums. The diameter is 3/32 in. on this corrosion-resistant reel of replacement garage door cable. It meets federal RR-W-410 specifications.