All frames, except the 450 mm dia. -made of sheet steel and wire cloth sieves are manufactured from stainless steel. Perforated plates are made from tinned steel. Sieves having the same nominal dia. are designed to nest one in each other. Using 200 mm sieves (8") is possible to test up to 1000 g of aggregates and 3000 g with 300 mm (12") dia.