From the material points, can be divided into: galvanized iron, zinc alloy. From the performance, can be divided into: need to hole, do not need to punch two. No hole is what we call a bridge hinge. Bridge Hinge looks like a bridge, so commonly known as bridge-type hinge. It is characterized by not having to drill holes in the door panel and is not subject to design restrictions. Specifications are: small, medium, large. Need to punch holes, is now commonly used in the cupboard door of the spring hinge and so on. Its characteristics: the door door must be punched holes, doors of the design hinges, the door will not be blown off after the wind, no need to install a variety of touch spiders. Specifications are: &26, &35.