This aluminum extension adaptor is suitable for 80mm square or round profiles, its standard length is 500mm and its width is 64mm, customized sizes are available too. With four screws on two sides of this connector, it can be connected with the square posts easily and firmly. By using this aluminum connecting adaptor, many large-size booths can be realized easily. Lingtong’s products are all reusable and non-polluting, to realize our vision: Bring Environmental-friendly Exhibition System Into Every Expo Space. By adopting the German standard, the quality of Lingtong’s products is well accepted by European and American markets.