Industrial Chain 1. International Approvals: BV /ISO /DQS /API /AAA 2. Prompt Delivery 3. Experienced Staff Industrial Chain: Why Choose Us ?1. Hangzhou Donghua Chain Group Co., Ltd established in 1991, we have 5 subsidiaries in china and have 6 subsidiaries abroad;2. we covering a production area of 200,100 square meters, have more than 1,800 sets of advanced equipment and over 3,100 highly ...