Abstract: An insulation stripping apparatus is disclosed including a tool housing (1) containing a slitting channel (6) for laterally receiving an insulated conductor (7). A clamping or support body (10) connected with the tool housing carries at least one knife cassette (33) that is laterally adjustable longitudinally of the slitting channel in a corresponding cassette-receiving opening (26) contained in the clamping body between different cutting positions relative to the conductor. The thickness of the knife cassette is appreciably less than the length of the groove, whereby a plurality of knife cassettes may be mounted for simultaneous cutting of the insulation at desired cutting depths and at a plurality of longitudinally displaced positions, respectively.