The function of this extension adaptor is for the connection between profiles, it has high eccenter holes, and includes 3 pieces of M10*16 sets screws, its material is aluminum alloy and its standard length is 180mm, customized sizes available. This connector is suitable for 40mm square extrusions and 8-way upright poles, thus it is widely used for shell scheme booth. Lingtong’s products are all reusable and non-polluting, in order to realize our vision: Bring Environmental-friendly Exhibition System Into Every Expo Space. The quality of all LT materials comply with German standards, it is well accepted by European and USA customers.