Top 10 enterprises of self drilling screws in China.

Handan Shuangzi Metal Products Co., Ltd is a professional manufacturer of drilling screw and tapping screw enterprises. Since its establishment, the company has been focusing on the production and R&D of drilling screw, which has built a modern, high standard, scale, variety of professional production line of drill tail screw. All used equipment are imported from Germany, Japan and Taiwan, with an annual output of high quality, multi-variety drill tail screw .The employed the top domestic technologist, in hexagon-shaping、clipping、thread-rolling、carburize、zinc plated、washer machine、package and other processes, every link strives for perfection and the best.