Galvanized Iron Perforated Metal Screen 1.thick:0.2-12mm 2.open area:10%-70% ... .width:0.5m-3m 4.shape:Round, Square Galvanized Iron Perforated Metal Screen Punch Metal /Punched Metal/perforated metalMaterialCarbon steel, Aluminum, Brass ... to the environmental noise control barriers, architectural objects, walls, generator room, factory premises, and other noise acoustic noise sources using sound ...