Bop, Mud Pump, Casing Centralizer manufacturer / supplier in China, offering API Thread 13 3/8′′ 9 5/8′′ Float Collar and Shoe for Casing, API Heavy-Weight Drill Pipe 7-1 Nc 38 Connection Hwdp for Drilling, API Thread Drill Rod Tool Joint S-135 Grade If Connection Pup Joints and so on.