Duen-Yih Metal Industrial Co., Ltd. is a professional and experienced door lock manufacturer that has been engaged in producing heavy duty mortise lock (similar as Baldwin style), lever handle sets (made with Solid brass, Stainless Steel/, Zamak etc..), electronic magnetic card lock and various lock parts for more than 30 years in Taiwan. We are not only have been certificated by ISO-9001 (year 2000) but most of our products have been approved by UL authorized as 3 hours fire resistance. Thus is why our products have been accepted to many countries worldwide for years. Besides manufacturing locks of our own brand name as DANDY, we also specialize in providing OEM/ODM as project service for customers. We are also willing to supply high quality products from our own factory in Shanghai of China.