DTH Bit, DTH Hammer, Button Bit manufacturer / supplier in China, offering DTH Drill Rod Drilling Pipe Tube with Different Length, 76mm 2 3/8" DTH Drilling Tube Drilling Rod Drilling Pipe, 2 3/8" 2-7/8" 3-1/2" 4 1/2" Reg DTH Rod Drill Pipe Drill Tube with Wrench Flat for DTH Drilling and so on.