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