Conform to EN 50085. Thanks to a particular shaping of the ends obtained by means of deep-drawing during the phase of sheet-steel bending, the connection between straight elements of C5 series is by an originale (Male/Female) snap-on. By virtue of this, the necessity to use linear joints is extremely limited. All the accessories of C5 series have a continuous border on the sides. In the center of each end of the widths there is a circular salient perforated area securing the electrical continuity. The continuous border on the sides (edges) guarantees a greater load resistance and allows mounting all the covers of the system with no necessity to use screws or clips. Various components are assembled with screws (with square under-head) nuts, washers, wich are to be ordered separately.