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Our door closers use aluminum alloy precision die-cost body for execellent quality and worry-free application. Our door closers also use advanced and durable gasket, with all leak rate lower than 1/1000. Perfect macthing between transmitted piston and gear,with special high intention material to ensure closer to work durable, quite and high effcient. The quality carbon steel of our door closers is used piston structure. To allow stable transmission&quite, our door closers can be installed on left/right hand door, without adjustment. With two independent adjustable values, which can be adjusted closing range at 120°-15° and 15°-0°