... zinc alloy/4. Process: Die casting, Deburring, Drilling holes, Tapping, CNC Machining and Assembly.5. Surface treatment: Sandblasting, ... secondary processing such as oil spraying, screen printing, assembly ect. -Traceability is maintained from all inspection gages ... zinc alloy/4. Process: Die casting, Deburring, Drilling holes, Tapping, CNC Machining and Assembly.5. Surface treatment: Sandblasting, ...