TOSF 120B De-stoner is used for the separation of light and heavy materials from grain. The machine also sorts the grain in to heavy and light fractions. The machine can also be used for separation of other products such as wheat flakes, peanuts and in the seed cleaning industry. The discharged stone from primary sieves contains some grain. This mixed fraction is sent to the secondary sieve using blowing air from a built-in fan where stones are concentrated and discharged. The allows amore efficient stone/grain separation to be made.