Fast and convenient milling of wall slots in a wide range of materials is possible. Highly labor-saving due to the intelligent system of interlocked segments, as it is no longer necessary to chisel out the center bar. High time savings are achieved by milling in one operation. There is a reduction of dirt and dust, as the material is removed cleanly and completely from the slot. Precisely fitting slots for single pipes with a diameter of 12 mm or for 20 mm and 25 mm empty pipes. Maximum cutting width: 20 mm (2-row) or 30 mm (3-row).