Likewise, in an embodiment of the mating elements 6, 7 as a tongue-and-groove connection, thetongue-shaped mating element 6, 7 may be provided on the insert seat 4 and the groove-shaped element 6, 7 may be provided on the cutting insert.Likewise, the fastening of the cutting insert 2 may be effected not only by clamping screws 5 as shown but also by other clamping elements, such as wedges or clamp