Large format sheets grow in size and thickness. The main consequence of this evolution is the difficult handling of such heavy materials. With the crossbar supplement, the SLIM EASY TRANS by RUBI increases its robustness and facilitates the handling of the aforementioned parts. The set of crossbars allows to adjust both the width of the piece and its length giving the SLIM EASY TRANS greater rigidity in any format and form of the piece of large format sheets. Quick and easy mounting system.