Shandong Kerui Holding Group and Shengyou Pipes Co., Ltd. are located in the heart of the Yellow delta area---Shengli industrial Park, Dongying District, Dongying Ctiy. We keep the principal "customers' satisfaction is our eternal pursuit" and persist the business concept of "quality is life, credit is the development, management is the benefit". Various kinds of our products have been awarded API authentication and API monogram right of usage, such as drill pipe, casing, spiral drill string, drill collar, casing coupling, drill pipe joint, crossover subs, lifting...