... experience 1,Name: Carbon steel stamping part with black oxide coating;Carbon steel stamping part;Stamping part with balck ... ,copper plated,gold plated,chrome(3+Rohs &6+ ) plated,anodic oxidation,etc Dip plating black oxide coating,hot dip galvanizing, ... 3),Ability for the tolerance Roundess0.002mmCylindricity0.003mmRoughnessRa0.32Straightness0.01/200mm 3,How about the packing details?Plastic bags ...