With structurally strong and durable tension locks, we connect octagon uprights and beams to be cubic shell scheme booths.  Z991F tension lock is for all beam extrusion with lock chamber 21X12mm, eccenter dia 13mm.  Composed of steel shell, reed and eccentric wheel, made of high carbon steel, which is 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, Z991F tension lock is compatible with 4.3mm groove upright extrusion.  LT-Z991F