... /perforated metalMaterialCarbon steel, Aluminum, Brass, Copper.FinishPowder coated,galvanized,polished,or no finishHole shapeRound, Square, Slot, Triangle, ... is strong and serviceable.· Application: plate punching factory production network is widely used in lots of ... control barriers, architectural objects, walls, generator room, factory premises, and other noise acoustic noise sources using sound ...