... listed 2.meterial:aluminium 3.1 million cycles 4.hold open optional 5.closing & latching speed adjustable We are one of ... :503BC,523BC,504BC,505BC door closer6.Optional built-in Hold Open type:501D,502D,503D door closer7.High quality hydraulic fluid,low ... ,door closer operates smoothly from temperature -30 to 408.Reinforced type adjustable tube arm9.Standard packing without parallel arm bracket.The ...