Spring Steel Lock Spring Manufacturer: Spring Steel Die Casting Lock Spring, Nickel Plated Surface, used as lock part. Product: Lock Spring. Materials: Spring Steel. Processing: Die Casting. Surface Treatment: Nickel Plating. Application: used as lock part. Payment Terms: L/C, T/T, M/T, D/D, D/P, D/A and others. Origin: Dongguan, Guangdong, China. Packaging Details: blister tray, carton, tray, container. Terms of Delivery: FOB, CFR, CIF, DAP, DAT and others.