This tension lock is suitable for all kinds of 120mm square and round extrusion, it includes two screws LT-EG409/13, by using T30 Hexagon spline wrenches to fix screws. This connector has three parts: shell, eccentric and reed. The shell of this lock is zinc alloy. 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. Up to now, LT products have already been sold to more than 103 countries all over the world.