Circular base or top of 1m (3.28 ft) diameter with square profile cross inside. The product comes equipped with 1-way male connectors for easy and fast truss connection of our box truss series lines FT34-TT34. Main frame tube is 50 x 2 mm (2 x 0.08") and the cross profile is from 50 x 50 x 3 mm (2 x 2 x 0.12").