... steel, stainless steel ,aluminum alloy,brass, bronze,copper, according to customer requestFinish:Anodizing,plating,electro-polishing ... machining function ),Grinding machines(including Internal,External and Centerless grinding machine),Wire cutting machines.2).Machining:.CNC milling ... steel ,spring steel ,aluminum alloy,brass, bronze,copper, plastic ,according to customer request4).Finish:Anodizing, ...