Henan Dongfanglong Machine Manufacture Co.,Ltd was founded on 1999, with the location of the Intersection of 106 National High way and Jintian Road, East Industries Areas of Puyang, Henan, China. We have more than 15 years of experience of producing, developing and selling tubing coupling,casing coupling,pup joints,tool joints,and so on. We have the ISO 9001 Quality Control Certificate, API - 5CT Certificate.