a tool unit for a comminution device with a rotor - stator system is provided , in which comminution tools are detachably fastened to tool holders on a rotor circumference and work together with comminution tools located on the stator . in order to shorten the tool replacement downtimes of a device equipped with such a tool unit and to increase its profitability , the tool holder includes a first carrier section and a second carrier section , the rear sides of which sections detachably contact one another in a common contact plane , and on each of the mutually averted front sides of which is located at least one bearing surface for accommodating a tool .