9/16" x .055" x 3-1/16" Steel Compression Springs SPRC-313 (6 pcs.)

Diameter: 9/16"
Diameter 2: .055"
Length: 3-1/16"
Material: Spring Steel
Nominal Size: SRM166
Type: Compression Spring
WireDiameter: .055 WG

Box of 6.

Compression springs are coils designed to become shorter when loaded. Their turns are not touching in the unloaded position, and they need no attachment points.