Variety:Round hole standard sieve round hole perforaed metal sheet The hole diameter:0.8-100mm 1.Introduction1)The Punching sieve ... and cooling ventilation.2)The main products is also called punch plate, perforated plate, perforated plate, mine screen, screen ... plate, galvanized plate.4)Sieve-shaped with round hole, square hole, diamond hole, elliptical hole, hexagonal holes and so on.5)Can be ...