Metal door handles and security locks are typically made from Zamak (zinc alloy) or aluminum alloy, or brass. They require high-quality finishing with various colors. PVD Ion Plating technology has been effectively used in this application. After appropriate surface pretreatment before PVD coating, such as polishing, brushing, or sandblasting, the PVD galvanoplasty system provides various colors. The deposited films are pure metal or multiple layers like tin, Ti, ZRN, CrN, TiAlN, with bright colors, strong adhesion, and excellent scratch protection, fast deposition rate, and good diffraction.