... /Nickel/Chrome/Tin Plating Compression Springs, Ends Closed and GroundWe produce Standard compression springs, conical springs, and barrel springs all with open, closed, ... 3. Certificates ( ISO9001:2008 & ISO14001:2004):4. Photos:Notes: All springs and wire forms are tempered, oil hardened or salt spray ... required, we give you our best service and support! Compression Springs, Ends Closed and Ground