... 20 years experience in special fastener 1,Name:Metal step ferrule;step ferrule;metal ferrule 2,For the similar ferrule, ... while,colour,dacroment),Nickel plated,copper plated,gold plated,chrome(3+Rohs &6+ ) plated,anodic oxidation,etc Dip plating ... etc Polishing Grinding and polishing,etc,except mirror finish (3),Ability for the tolerance Roundess0.002mmCylindricity0.003mmRoughnessRa0.32Straightness0.01/ ...