Used to separate and grade soil samples. Stacked set consists of 4 screen sieves with graduated mesh sizes, a solid container at the bottom, and a lid. A soil sample is then placed in the top container, and the entire set agitated so that particles of various size will drop through and are sorted by size. Each kit includes 4 high impact plastic sieves, 6" with wire mesh Nos. 6, 20, 40 and 100. 1 bottom pan and 1 lid.