Sieves/Sifters - Sieving is a simple and convenient technique of separating particles of different sizes or to separate wanted elements from unwanted material like bran or even tiny insects from the flour using a woven mesh or net.
Sometimes a muslin cloth (a thin, loosely woven cotton cloth) is used for fine straining purposes such as to drain curds, strain juices, or often is used to line a sieve.
The traditional flour sifters are round in shape, with several discs (to control the fineness of flour) that fit into a plastic or a metallic hollow cylinder whose diameter is almost the size of a Thali/plate. A small sieve used for sifting flour has very small holes which allow only very fine flour particles to pass through.
Flour sifter with sieve discs of different hole sizes.
Different sizes of sieves.
There is another hand held sieve or Chalni which is used to filter / strain, solids in the liquids. For example, to filter out tea leaves from the tea into a cup or filter tomato puree to remove seeds etc into another vessel.
These are available with a stainless steel body fitted with a stainless steel or plastic mesh with a long handle which helps in holding. Sometimes the entire product is made of plastic with a plastic mesh.
Hand held sieve ( Chalni/ Charni )