With structurally strong and durable tension locks, we connect octagon uprights and beams to be cubic shell scheme booths.  Z912 tension lock is for upright beam extrusion S108, S201, S208, S408, M311,  between 30°-150°.  Composed of aluminum shell, reed and eccentric wheel, made of aluminum and high carbon steel, which are high-quality material. Strong compressive ability, strong enough thickness and hardness, and is not easy to deform, the loading capacity is within 2.5mm after 25KN loading. Only a wrench can be used to complete the construction of a booth, Z912 tension lock is compatible with 4.3mm groove upright extrusion.