This dia.80mm round extrusion is widely used as the upright profile for the modular booth. This round pole has 5 system grooves, and the groove width is 4.3mm, these five grooves are on the half side, thus standard aluminum beam can be locked on it, and there’s no groove on the other side, thus it can be more beautiful when it is shown. Lingtong usually use this round pillar do some standard exhibition stands, customized booths or any other special-shaped products... Lingtong’s products all comply with German standards, the quality is well accepted by European and USA customers.