Anti-drop, double-safety design Material:SS304 Spec.:10",12",14",16",18",24" Bar thickness:2.5,3.0mm Square slot:width 2 FRICTION STAY SERIES Material:SS304, SS202 .All rivet joints are spun-riveted with special nylon washers in between for extra smooth actionBe suitalbe for UPVC windows and ventilators.Operates normally after 30000 times strict opened/closed.It provides adequate friction at all ...