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Shanxi Fenglei Drilling Tools Co., Ltd (SFDT) is the leader of drill stem technology and drill string components, which is granted API Spec.7, 7-1, 7-2, ISO 9001, ISO 14001 and ISO 18000 certificates. The company was founded in 1968 and has been manufacturing the top quality drill collar, integral heavy wall drill pipe and kelly since 1978. Its welded (heavy weight) drill pipe production line was put into production in 2003. ……