Prime-Line GD 52102 Safety Cables, 1/8 inch, Carbon Steel (2-pack) These extension cables are made from galvanized carbon steel. They install through your extension springs to prevent injury in case of breakage. These safety cables are required on California installations. Features Galvanized steel wire 1/8 inch x 8 ft.-8 in Prevents injury in case of breakage Required on California installations 4 cable set use on dual spring doors Cable clamps included USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.