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Description Product Description For use on overhead sectional wood and steel garage doors with extension springs. Installs through length of extension spring and spring loops. Helps prevent personal injury or property damage if extension spring breaks. Constructed of durable 7 x 7 - 1/8" aircraft cable. One end looped and ferruled, the other end fusion cut. Includes cable clamps to help ensure proper cable tie-off. From the Manufacturer Garage Door Extension Spring Safety Cables, measure 8 feet 8 inches by 1/8-inch diameter. Hot dipped Galvanized carbon steel aircraft cables used on extension spring doors. They will replace the cables on most wood doors.