5/16" x .040" x 10-1/2" Steel Extension Springs

Diameter: 5/16"
Diameter 2: .040"
Length: 10-1/2"
Material: Spring Steel
Nominal Size: SRM173
Type: Extension Spring
WireDiameter: .040 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.