http://tinyurl.com/lbshs76
Forney 72588 Wire Spring Extension (10-315), 7/16-Inch-by-8-1/2-Inch-by-.047-Inch
Used in light industry such as screen doors, chaise lounges, toys
Zinc plated steel wire extension spring
Baked for a rust resistant finish and heat treated for performance and longevity
Ideal for a wide variety of uses in homes, the shop, on the farm or ranch, small businesses