The double rotors of the DR line are flexible and efficient designed for special material processing. The same reliability and strength of the two-shaft grinders combine to control the size of the output material typical of a single shaft, for heavy-duty use. The use of interchangeable shafts and the application of sorting grills guarantee pieces of a constant and controlled size. In addition, the machine offers dual production in a small space, because the two opposing rotors generate a double screening surface with respect to a traditional machine of this length. The technology can use an electric or hydraulic motor drive for particularly heavy-duty uses.