... steel alloy 3/ black finish 4/ ISO9001 manufacturer Product TypePhilip head machining screwsMaterialStainless steel, Carbon Steel, copper, ironMachining method Screw machiningSurface ... door to door service.Application Surgical instruments, Optical products, LED flash lights, mobile phone etc…RemarksAll parts are not in ... are looking forward to our Win-Win Cooperations!! philip head machining screw