This extension adaptor is suitable for 120mm square or round extrusion, its material is aluminium alloy, and its standard length is 500mm and its width is 115mm, and its size can also be customized. The connector includes 8 screws LT-EG409/16, which can fix it with 2 pieces 120mm square or round profiles. This fastening is widely used for long-span structure. With the idea of "Green Exhibition", all of LT products are environmental-friendly and non-polluting, and they can be reused. By adopting the German standard, the quality of Lingtong’s products is well accepted by European and the U.S. markets.