Drilling Rig, Drill Bits, DTH Drill Rig manufacturer / supplier in China, offering 127mm High Quality Dual-Wall RC Drill Pipes with Remet/Metzke Connection, RC Drilling Rod Remet/ Metzke Thread Drilling Pipes Well Drilling Tools Price, Remet/ Metzke RC Drill Rod Reverse Circulation Drilling Pipes on Sale and so on.