System BACK represents options of connecting legs with wooden or perforated metal backs. In this way a stable table base is crated. The wooden back 18 mm thick is manufactured by a furniture manufacturer the alternative are metal backs in standard constructions and dimensions. The frame for connecting legs with the wooden backs is attached in a set with the legs. The plans for manufacturing the wooden back are found in the technical description of this program. The width of the back assures grater firmness. Installation is quick and simple. System BACK is intended for table plates of thickness more than 24 mm.