Materials : Carbon steel, stainless steel plates, aluminium, AL-Mg alloy plate The kinds of hole: Long, square, round hexagon, scale stretch-special shaped hole. Characteristics : Rsisting bending, resisting rusty, artistic variety, glossy, durable. Using : Our production of punching-hole screening board is widely used in protecting from ambient noise where the highway, railway and subway come through the city. It can also be used in building wall power station ,factory ceiling wall plate and other source of noise in order to sound absorption.