Utility Extension Spring 2 pack 7/16"x 1-7/8"x .047"Extension springs are also known as tension springs, these create resistance to pulling force, and can be used in several applications. These are especially useful in garage door assemblies, vise grip pliers, carburetors, farm machinery, automotive interior and exterior, and so much more! These utility springs are great to absorb and store energy. The close wounding of the spring allows for initial tension, which aids in manipulation of load and rate.