<p>The system has a connecting piece (18), applicable in a channel (22) running transverse to surfaces of profile bars (12, 14) to be connected on miter, having an external thread (20) at end. The thread (20) is fastened in a thrust bearing piece (24). The piece has an opposite end with a recess (26) that is applicable in a thrust bearing piece (30). The bearing (30) is applicable in a channel (28) running transverse to the channel (22). The piece has an internal thread (32) for accommodating screws (34), where thread (32) has a front end brought into engagement with the recess (26).</p>
