Special Tools for Internal Machining Special Tools: Internal Machining Drills / mills Thread whirling tools Internal grooving and face grooving tools Broaches / punches System DRILLWEX(internal grooving and form drilling tool) System HSM(relieving tool) System MFE(4 + 6 mm Ø) System MFE-IK(6, 8, 10 mm Ø)