The line for car window-grooves is a line specifically dedicated for automotive profiles, where narrow dimensional tolerances are required. The line consists of a decoiler, which can be of various types to correspond to any necessity of production, and then follows the introducer strip guide and the roll forming machine with dedicated rolls. Once the profile has been obtained, the subsequent calibration and horizontal bending heads and the twisting head are of particular importance, as they give the precise and required shaping. The last phase is the cut executed by the cutting die which has adjustments on several axes in order to obtain cuts with varied angles required by the various production needs.