1.Double spped 2.High-quality hydraulic oil,smooth move 3.Max Door Weight :150kg 4.30,000 times test 5.Three ... Action ,Double CylinderIts Feature:1.Have passed many opening and closing tests,meeting safe application standards;2.Filled with high quality hydraulic oil ... question,pls feel free to contact with me! 150kg,Double speed ,high quality floor spring & door closer &door hinge;floor hinge ,LD-84