... 3)Application:auto,toy,electronic 4)Certificate: SGS Spring Features 1.Material:steel,stainless steel.brass,aluminum,brass ... process 4. Strict testing in quality with advanced machine Our Advantage; 1 FactoryEstablished in 1975,got SO ... analyzer device imported from Germany,vacuum melting furnace,CNC machine center...8Test Euipmentspectrum analyzer, Physio-chemicalLabora tory 9Production lines1 ...