... fiel Name: metal machinery casting part Ability for the material of this kind of hanger: Grade3.6,4.6,4.8,5.6,6.8,8 ... ,dacroment),Nickel plated,copper plated,gold plated,chrome(3+Rohs &6+ ) plated,anodic oxidation,etc Dip plating black oxide coating,hot ... experience for exporting so that you couldavoid lots of risks. metal machinery casting part