Xuzhou Shuangzheng machinery Co.,Ltd. is a professional manufacturer of slewing bearing and slewing drives,Website:http://www.szslewingring.com, integrating design, manufacture, research and development. It covers an area of 10,000 square meters and the company has two production lines, one for special orders and another one for mass orders. There is a special quality testing laboratory, dedicated on the research of product design and development, product application and testing method.