Yinan Machinery (Shenzhen) Co., Ltd., the former South Machinery (HK) Ltd., has had the history of more than 30 years in specialized production of all kinds of bronze and special C-alloy screws, with its product quality recognized and welcomed by clients worldwide. Its export volume of copper screws has ranked the first continuously for years among the enterprises in HK of the same industry. With the constant development and expansion, it moved its production base from HK to Shenzhen in the Chinese Mainland in 1992.