for cutting composite pipes with a diameter of 12.0 to 25.0 mm and for cutting flexible protective pipes with a diameter of 18.0 to 35.0 mm without damaging the internal pipe, easily exchangeable blades, possibility of attaching a calibration mandrel, e.g. for Geberit composite pipes Ø 11.5 and 15.0 mm, high-strength special steel, hardened and tempered in oil, blades: special tool steel, oil-hardened, replaceable, tool body: special quality chrome-vanadium electric steel, oil-hardened