The upper window hinge is a new design, through excellent processing technology and high-quality raw materials, the performance of upper window hinge up to a higher standard. We are perfect for every detail of the upper window hinge, guarantee the quality level, so as to bring you the perfect product experience. 3H INC. is a professional China upper window hinge manufacturer and supplier, if you are looking for the best upper window hinge with low price, consult us now!