With the cutting heads ACTIVE AUTOLINE II and ACTIVE IDE II for abrasive water jet cutting, KMT Waterjet Systems has developed abrasive cutting head assemblies that provide the best efficiency by utilizing long life components. Thus, maintenance efforts can be reduced and running times extended. The diamond orifice and the mixing chamber are combined in a single nozzle body. Both professional users and workers who have only recently been introduced to abrasive cutting benefit from the simple design of the unit as the focusing tube and the pre-filter, which are the only wear parts, can be exchanged easily and quickly.