It is an Upright Extrusion in showcase system. Two extrusions can be connected vertically on both sides of the Upright Extrusion. It has 2 system grooves. The third groove can be used for screw to support panels. And it can be used as table legs or body of a showcase. It has two sides which are smooth surfaces. Its size is 25*25mm. It weighs 0.420kg per meter. Its max length is 6m. If you have any other requirements, LingTong will meet your needs. It is made of aluminium. The products of LingTong are green and environmentally friendly. If there are some relative needs, LingTong will provide the best service for you in exhibition construction.