Used for fine materials made out of 20cms. Diam spun type joint less polished brass frame easily fit on each other equipped with stainless-steel wire mesh aperture Size:- 4.75mm.,2.36mm.,1.18mm.,600mic.,300microns,150mic.,5.60mm.,4.75mm.,4.0mm,3.35mm,2.80mm.,2.0mm,1,70mm,