Coil razor wire has many circles. Tie every two adjacent circles by clips, and a spiral razor wire is created. The clips one circle needed is depended on the diameter of the circle. Generally speaking, the diameter of an opening circle would be 5-10% less than its original size. Circles of spiral razor wire cross each other, leaving no space for a person or middle-sized animals. Spiral razor wire improves security level. Hence, it is widely used in boundary, residential and commercial places, prison and institutions. Galvanized razor wire has good resistance to all weathers, corrosion and acid rains. For years, silvery appearance will remain for a long time.