Metal frame 1.part material :steel ,stainlees stell 2.finish:coating , galvanzied ,polisehd Customerized steel precision stamping part ... : polished, Zinc plated, nickel plating, chrome plating, powder coating, e-coat, HDG, black anodizing. Mould designed in house ... process:Milling, drilling, threading, welding, polishing, assembly.Inspection:Coating thickness tester, roughness tester, Go/Not-go gauge, ...