Material: aluminum alloy housing + nickel-plated steel parts; The bracket is replaced by a metal bracket with nickel-plated surface, easy to install and maintain, long service life. Suitable for home, office and hotel room doors. Door weight 45kg, door width ≤ 1000mm, door opening angle up to 150°. The height difference between the door frame and the door should be less than 5cm. If the door frame is too high, you need to use material to raise the bracket so that it is parallel to the door frame. For best results, please make sure that the door opens and closes naturally and there is no excessive resistance. The spring tension can be adjusted within a certain range.