Prime-Line® has been supplying repair and replacement parts for windows and doors since 1978. These torsion spring cables from Prime-Line® feature galvanized carbon steel construction for superior strength and lasting durability. The 1/8-inch diameter cable acts as a safeguard for your garage door, should a torsion spring ever break. These 8-foot 8-inch cables are designed with looped ends and stops and are intended to be used on doors measuring no higher than seven feet.