... treatments:deburr,polishing,sandblasting,nickel plating 2.for machinery,autos,equipments Features of Zinc Alloy Die casting1)Material: carbon steel, ... brass, aluminium alloy, zinc alloy.2)Utility: machinery, autos, equipments.3)Surface treatments ... nickel plating,chrome plating,oxidation,plastic,spray-paint,ect. zinc alloy die casting for pushbutton switch bottom