garage door spring

1.Garage door torsion spring have two types surface finishing:galvanized and non galvanized,please see below photo: a)galvanized spring: b)non galvanized spring: 2.The longest spring that we can make is 3.5meter 3.the wire diameter and spring diameter can be choosed from below sheet: Just tell us the size that you want,then we can provide our best price for you. The torsion spring used with spring fitting,such as: We also can match the correct spring for you according to your door size,and total lift weight.it is very important to match the correct spring for a door .please contact us if you have any needs,thanks.