Core Drilling Rig, Water Well Drilling Rig, Rock Drilling Rig manufacturer / supplier in China, offering H22*108mm 800mm Integral Drill Rods for Quarrying Very Hard Rock with 34mm and 40mm Head Diameters, H19 H22 Integral Drill Rod/ Integral Drill Steel 108mm Shank for Mining, 7 Degree Drill Rod Tools Taper Rock Drilling Rod and so on.