The Aanraku Frit Sifter is an indispensable companion to the Aanraku Frit Maker Piston . With this handy tool, you can easily sift your newly created frit into four different grain sizes- powder, fine, medium and coarse. This set contains four 3.75" tall heavy duty cups, with 4.5" diameter screens. Mesh size of the screens are as follows <0.2mm, 0.2-1.2mm, 1.2-2.7mm, and >2.7mm. Helps turn your scrap glass into inexpesive frit!