It is an Upright Extrusion in showcase system. Three extrusions can be connected vertically on three sides of the Upright Extrusion/22mm. It has 3 system grooves. And it can be used as table legs or body of a showcase. It has a side which is a smooth surface. Its size is 25*25mm. It weighs 0.415kg per meter. Its max length is 5m. 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.