Rocker Screen Frame and Pan uses manual agitation to efficiently separate coarse grained samples, yielding accurate gradations. Sets consist of a 12in (305mm) square steel frame to hold interchangeable wire cloth squares and a bottom pan. Stainless Steel Wire Cloth squares are held in place by two bolted side clamps with wing nuts and feature sturdy handles for rocking or transport. Order required squares separately in desired mesh sizes. All squares can be clamped into the frame for carrying or storing when not in use. Frame height above cloth is 5in (13cm). Not recommended for use with sizes below No. 20.