... Brass coupling;Female coupling 2,For the similar coupling,what can we do ?(1), Ability for the material of this kind of ... (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 ...