Easy to Install: Easy to install plastic shutters and slides on the surface. This spring loaded door closer can be used for doors up to 68 kg as well as left and right doors. Easily adjust the tension of this door closer with safety spring. Installation Tips: To avoid excessive tension, adjust about a quarter turn each time and test the door after each adjustment. Excessive tension may cause the spring to bend. Adjust at any time: Two independent valves can adjust the swing motion and the closing mechanism of the door arm at the same time, so that the opening force and closing speed can be adjusted.< /p>[Safe and Effective]: Don't let the door hit you when you go out! For your safety, our hydraulic door closers ensure even and safe closing. Material: The lightweight door closer is made of zinc alloy, spring loaded; anti-oxidation, anti-corrosion, no rust, stable, wear-resistant, weather-resistant, quiet, safe closing.