Diameter: 3/4" Diameter 2: .11" Length: 3-13/16" Material: Spring Steel Nominal Size: SRM56 Type: Extension Spring WireDiameter: .11 WG Box of 6. 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.
eBay