... copper. Brass, aluminum or as per customer’s drawing. Surface treatment: polished, Zinc plated, nickel plating, chrome plating ... drilling, threading, welding, polishing, assembly.Inspection:Coating thickness tester, roughness tester, Go/Not-go gauge, salt spray testing, and ... press machine. 3. Professional assembly ability 4. Excellent surface paiting. 5. Fast delivery and quick feedback. Sheet ...