This tension lock is the connector for all kinds of 60mm square and round extrusion, it includes two screws LT-EG412/8, by using T25 Hexagon spline wrenches to fix screws. This connector has three parts: shell, eccentric and reed. The shell of this lock is zinc alloy and all the materials are in high quality, thus it has a longer life span. 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.