Flexible line for the production of cable channels. This solution carries out the punching and cut before the roll forming/bending, therefore the changing time is very short and it is not necessary to change the cutting dies. The punching can be excluded with rapid changes between one dimension and another (as option it is possible to have supplementary lateral punching units). Besides in the bending both width and height of the channel are changed automatically from the control desk (roll forming line with mobile supports). On request unloaders/stackers with automatic steel strapping unit.