DTH Bit, DTH Hammer, Button Bit manufacturer / supplier in China, offering Good Quality API 2 3/8 76mm 89mm 114mm Water Well Mining Machinery Parts DTH Drill Pipe Rod, Factory API 2 3/8 Reg Rod D76 /89/114/127/152 Drill Pipe 1.5m 2m 3m 4m 5m 6m DTH Drill Pipe, 1 Meter Hwdp Heavy Weight API 5dp Drill Rod Pipe for Oil Drilling and so on.