1) Hole shape: square, round, oblong, triangle 2) Thickness: 0.3-3.0mm 3) Materials: ... widely used for wine-making, malting, paper-making, mining, crement-producing, food-processing, oil-refiningm painting as well as the industries ... of cigarette, sugar, foodstuff, noise-sliencer, environmental protection, agricultural machine, chemical industry and pharmacy industry,