Core Drilling Rig, Diamond Core Bit, PDC Bit manufacturer / supplier in China, offering 200 Meter 220m Water Well Drilling Rig Depth Pneumatic DTH Crawler Drilling Rig for Water Drilling Machine 200m Borehole, 100m 300m 400m Drill Rig for Water Well 200m Perforadora Pozos Pneumatic DTH Crawler Drilling Rig Water Well Drill Rig Machine, Factory 4 6 Inch 122mm PDC Core Drill Bit Water Well Drill Bit Rock Borehole Bit for Well Drilling and so on.