Prime-Line GD 12207 Extension Spring, 1-19/64 in OD, 22 in OAL, Carbon Steel, Galvanized, Loop End, 150 lb 2 springs per wood door and 4 springs fiberglass door Replaces most 7 ft residential garage door configurations Heavy-duty (10, 000 cycles) extension springs have double loop ends for extra durability. 5 sizes will replace most all spring configurations on residential doors that are no higher than 7 ft. 1/8 in galvanized carbon steel aircraft cable. Color: Silver End Type: Loop Finish: Galvanized Material: Carbon Steel Outside Diameter: 1-19/64 in Overall Length: 22 in Suitable for: 9 ft W x 7 ft H Wood Doors 16 ft W x 7 ft H Wood Doors Weight Capacity: 150 lb Wire Diameter: 1/8 in