1.Double spped 2.High-quality hydraulic oil,smooth move 3.Max Door Weight :150kg 4.30,000 times test 5.Three years ... ,patch fitting,glass door clamp, glass door lock etc. door hardware products. Have more than 15 years experiences in this line . Could supply the high quality ... ,pls feel free to contact with me! 150kg,Double speed ,high quality floor spring & door closer &door hinge;floor hinge ,LD-84