... 3 coloured zinc plated 4 ISO9001:2000,ROHS 5 Automotive,machine 1. MaterialCarbon steel, Spring steel, Stainless steel, Alloy ... cataphoresis,anti-rust oil4. CertificationISO9001 Certificate, RoHS5. ApplicationsExtensively used for industrial machinery,model springAutomotive, medical device, agricultural machinery ,electronics, ... cartons or as per customers' requirements Compression Spring for Machine