... perforated plate mesh has round,length,square,scale hole,hexagonal hole and so on.It is of superior abrasion resistance . Byname perforated chair ... scale hole, hexagonal hole.Material of perforated chair:low carbon steel plate,stainiess steel plate,brass plate,aluminum plate,nickel ... usage is extensive.Application:in public Hole shape of perforated chair :Long hole, round hole, square hole, triangle ...