A presetting device is proposed for a tool holder (1) which holds the shank (23) of a rotary tool (3) in an interference fit in a locating opening (5) and releases said shank (23) during heating, in particular by means of an induction heating arrangement (7), and which has inside the locating opening (5) an axially adjustable positioning stop surface (21) for the tool shank (23). The presetting device comprises a holder receptacle (11), which holds the tool holder (1) in an axial position and has an opposing reference surface (25), and means (43) for measuring the axial overall length of the rotary tool (3). The presetting device also comprises a measuring device (27) which measures the axial distance between the positioning stop surface (21) of the tool holder (1) and the opposing reference surface (25) of the holder receptacle (11) and has a measured-value indicator (55), the indicated distance value of which can be increased by the measured value of the overall length of the rotary tool (3).