TT series tertiary impact crushers are used in crushing the return of the soft and medium hard materials as a third crushing stage and to obtain high ratio of crushed sand. Due to its specially designed crushing chamber they produce much more percentage of fine product comparing with other impactors. The dimension of final crushed product can be controlled by mean of the adjustable braking bars. These crushers which are produced in several different sizes are driven by an electrical motor via V-belt and pulley.