Dongguan Shengang Precision Metal & Electronic Co., Ltd was established in 2000, who specializes in the manufacture of quality door & window building products, including concealed hinge, invisible hinge, door hinge, soss hinge, adjustable hinge, hidden hinge, italy hinge, germany hinge, 3d hinge, zinc alloy hinge, 180 degree hinge etc. Shengang is committed to fulfilling the most challenging customer requirements and is constantly seeking to introduce and implement new viable systems for the con