http://www.zhendapipes.com/ black matt cap suppliers CANGZHOU ZHEN DA PIPE INDUSTRY CO., LTD was founded in 2010, it is located in Yanshan County, Hebei Province, with a favorable location which can easily accessible to Beijing and Tianjin railways and highways. It is one of the largest manufacturer specilized in producing steel pipes in Northern China. It covers an area of 100,000 square meters with a fixed asset of 200 million RMB. We have 14 advanced production lines and scientific quality control system and high quality workers, For many years, we have been devoted to technical innovation and improvement of product quality. Also