... shape:Round, Square Galvanized Slotted Hole Punched Sheet Metal Punch Metal /Punched Metal/perforated metalMaterialCarbon steel, Aluminum, Brass, Copper.FinishPowder ... : It is punched to meshes. With the character of winding-resisting, Ageing-resisting, flat and smooth surface, ... punching factory production network is widely used in lots of cities across the highway, railway, subway and other ...