5/16″ x .040″ x 1-11/16″ Steel Extension Springs (12 pcs.)
Diameter: 5/16″ Diameter 2: .040″ Length: 1-11/16″ Material: Spring Steel Nominal Size: SRM90 Type: Extension Spring WireDiameter: .040 WG Box of 12. Extension springs are wire coils designed to become longer under load. Their turns are normally touching in the unloaded position, and they have a hook, loop or some other means of attachment at each end.