... . Finish Plain, Zinc plated, Passivized, Nickel plated, H.D.G., Black Oxide, Decrement, , etc.7. Production TechniqueCold forging, Hot forming, Machining, Heat ... qty of products?MOQ is 1000 pieces.3. What is surface treatment?It's Plain, Zinc plated,Passivated, Nickle plated, H ...