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Wire diameter range: 0.18mm-80mmMaterial:carbon steel, alloy steel, refractory steel, stainless steel , etc.Surface Treatment: Zinc plating, Nicked plating, chrame plating, spraying paint, etc.Usage: AutoOver 27 years manufacture experienceAdvanced manufacturing and testing equipmentStrict quality control and managementOEM is provided as per custom-designs spring, coil spring, suspension spring