16-gauge steel construction standard to be used with Model No. 180 Series brackets. Vertically adjustable in 1 In. increment. 5/8 In. W. x 13/32 In. D. Screws not included.
Sectional door extension spring has double loop ends. Replaces most spring configurations on residential doors that are no higher than 7 feet. Includes a galvanized carbon steel aircraft cable.