The GIPO roller grizzly is the ideal pre-classifying unit for clayey, hard-to-handle feed material. Whereas conventional pre-screens tend to clog and cake, the GIPO roller grizzly—with its horizontally rotating rollers and self-cleaning action—keeps material flowing. Downstream equipment in the material stream, such as a crusher, benefits greatly from this pre-processing, which measurably extends service life and reduces maintenance. The horizontal motion of the rollers evens out the flow and ensures the crusher is fed consistently.