a device for comminuting input material , especially for fine and ultrafine grinding of input material , includes a rotor revolving around a shaft inside a housing , the rotor having a cylindrical or conical jacket surface . an annular gap is present between the housing and the jacket surface , the gap forming a comminution zone and the input material being introduced axially to it . to increase the economic efficiency of the device , it is provided that a plurality of first pin - shaped comminuting tools for comminuting the input material are disposed over the circumference of the rotor , wherein the tools are aligned with their longitudinal direction perpendicular to the jacket surface in the direction of the housing .