To fix the indexable inserts for the bevelling tools
The screws have a hexagon recess on the thread side so that the indexable inserts can also be exchanged with a damaged screw and the screws can be replaced.

Suitable for:
KFM 15-10 F / KFM 16-15 F / KFMPB 15-10 F / KFM 9-3 RF / KFM 18 LTX 3 RF