1.Precise aluminum die-cast body with steel arm against rust. 2.Heat treated steel piston and pinion for high strength. 3.All season fluid eliminates the need for seasonal adjustment, working temperature from -38¡ãto+50¡ã. 4.Universal application for 3 installation type: standardtop jamb and parallel. Applicable door weight(kg): 25-45 Applicable door size(mm): 750 Total length(mm): 148 Hole to hole(mm):132*19