... steel, Galvanized Iron, Aluminum Hole: square,round,diamond, Hexagon Title:Metal Coated Mesh Speaker GrillRound hole punch perforated metal stainless ... steel, Galvanized Iron, Al Hole: square,round,diamond, Hexagon ... processing, electroforming and electroplating and so on. Metal Coated Mesh Speaker Grill Metal And Nonmetal ...