Duen Yih Metal Industrial Co., Ltd. was established by Mr. Shih Nan-yao Simon in Changhua city of Taiwan since 1973. It started from a factory with area about 300 square meters manufacturing one single product, then engaged in developing multifunctional, professional and approaching locksets.

It has been successful, in mass producion exceed 1,000 types and become one specialized manufacturer with the complete range of products among the multilateral trade in southeast Asia. Products manufactured by Dueh Yih have been marketed more than 30 countries worldwide. Another production base was established in shanghai since 1999 to cope with the domestic demands in mainland Chinese market.