Materials: Sheet in aluminum, mild steel, stainless steel, Al-Mg alloy, copper or nickel. Process: Punched into holes of diamo Materials: Sheet in aluminum, mild steel, stainless steel, Al-Mg alloy, copper or nickel. Process: Punched into holes of diamond shape, square, round, triangle, scale hole. General Use: With good strength, wear resistance and nice looking, expanded sheet metal mainly ...