... , ADC14, Aluminium alloy, steel alloy, magnesium alloy, AZ31B, 1045 steel, sus304, 45cr, 40cr, 38crsi, etc.Surface treatmentNickel plating, zinc coating, chrome plating, and oxidation ... , Polishing, chrome plating, phosphating etcCNC machining Tolerance+/-0.02mm( iron parts), +/-0.01mm( Aluminium parts)ThreadNPT ...