... , Galvanized Iron, Aluminum Hole: square,round,diamond, Hexagon Title:Metal Coated Mesh Speaker Grill Round hole punch perforated metal stainless steel ... 301, 304, 430, 201,303,316, etc), Copper, Silicon steel plate, Aluminum, nickel, Magnetic material and so on. The main technologies ... , Precise mechanic processing, electroforming and electroplating and so on. Metal Coated Mesh Speaker Grill