In response to developments in the market, the east leverage screw manufacturing company, established in 1991 in hong kong with a profit margin, was established in 1994 at the east leverage bridge in partnership with the sanzheng group. In 1997, the second industrial zone was established independently of east leverage port dav co. Ltd. Under the east ledge, and in 2005 it was expanded to the old perimeter of the east zhenxiang industrial zone, which covers more than 40 acres and covers more than 26,000 square metres。