Knipex Tools 90 25 20 Pipe Cutters For cutting composite pipes with diameters of 1/2" -1" and for cutting flexible corrugated conduit pipes with a diameter of 3/4"- 1 3/8". A calibration arbor can be fitted, for example for geberit composite pipes with 29/64" and 38/64" Dia. Tool body: High-grade chrome vanadium electric steel; oil hardened Blades: Special tool steel; oil-hardened, interchangeable