Our DENN CTA-660 CNC tube necking-in machine is one of the largest tube necking-in machine in the world. This heavy-duty machine is capable of working with tube lengths from 3 m (9.8′) to 12 m (39.4′); and material thicknesses from 11 mm (0.43″) to 35 mm (1.38″). Tubes out of aluminum, steel, titanium, or other materials can be end-formed with a wide variety of profiles.