... technique is adopted recently to ensure smooth and uninterrupted flow of material through sieving medium.;4. Aperture size: perforated plate for aperture ... .6mm, 1.18mm, 2.6mm, 4.75mm, 9.5mmStone Sieve Specification:2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm ...