TVS series vertical shaft impactors (VSI) are used as a second and third crushing stages for hard and abbrassive materials such as basalt and river gravel. Because of their low operation costs, they are more suitable for crushing the hard and abbrassive materials than other crushers. While some of the materials enters into the rotor, the rest of the flow is poured around the rotor. The materials are thrown with high speed thanks to the centrifugal force of the rotor and are crushed when they clash with the materials flowing around the rotor. These crushers which are produced in several different sizes are Driven by an electrical motor via V-belt and pulley.