The machine has been designed for the handling of brake discs inside of the processing line. The roller conveyor assembly consists of two sets of idle rollers positioned on inclined plane to allow the sliding of the parts thanks to the force of gravity. The machine is equipped with a arms rater, actuated by two pneumatic cylinders that work in synchrony. The arms move sequentially opening the forward pass and closing the one behind so as to allow the passage of only one piece at a time.