... mesh has round,length,square,scale hole,hexagonal hole and so on.It is of superior abrasion resistance . Byname perforated chair ... ,length,square,scale hole, hexagonal hole.Material of perforated chair:low carbon steel plate,stainiess steel plate,brass plate,aluminum ... nickel plate and various of nonmetal plate.Characteristics of perforated chair: the surface is smooth ,beautiful,the usage is extensive ...