One of the most important parts of making a good soil mix is obtaining the correct particle size. This sieve set lets you do it. The 12 inch (31cm) diameter stainless steel frame has 3 interchangeable screens in different mesh sizes (1/2 inch, 1/4 inch & 1/8 inch). Ideal for screening modest quantities of soil components to their correct particle size. The sturdy frame is made of stainless steel which will resist rust and corrosion. This is the last of the original Kiku products that were made in Japan.