... steel end core with rohs zinc plated Machined and turned SGS audited More than 20 years experience in special fastener 1,Name: Carbon steel ... ,gold plated,chrome(3+Rohs &6+ ) plated,anodic oxidation,etc Dip plating black oxide coating,hot dip galvanizing,etc ... Flame plating Light oil,spray coating,electrophoretic coating,etc Polishing Grinding and polishing,etc,except mirror finish (3), ...