... certificate metal OEM Material:stainless steel surface treatment 1)Key specification Material: steel color:black2) Description: Professional ... Treatment:Include quenching,High-frequency hardening,quenched and tempered,tempering,carburizing,nitriding,carbonitriding and so on.6.Surface Treatment:Include plating of ... Small Orders Accepted Tel:86-574-88071279 Welcome any inquiry! surface treatment