specifications of MB(Z) 4015 serial: Max processing width: 150mm. processing depth: 10-100mm. number of cutter shaft: 4/5/6. cutter shaft diameter: 40mm. feeding speed: 5-20m/min. specifications of MB(Z) 4023serial: Max processing width: 230mm. processing depth: 10-100mm. number of cutter shaft: 5/6. cutter shaft diameter: 40mm. feeding speed: 5-20m/min.