... ensure smooth and uninterrupted flow of material through sieving medium.;4. Aperture size: perforated plate for aperture size bigger than 1 ... .15mm, 0.6mm, 1.18mm, 2.6mm, 4.75mm, 9.5mmStone Sieve Specification:2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26 ... .5mm, 31.5mm, 37.5mm, 53mm, 63mm, 75mm, 90mm Test Sieve ...