AM-G-150Y drilling rig: 1.low energy consumption. 2.high efficiency. 3.easy to transport DTH drill rig used in opening mining,hydro-power plant,electric power stations central air pressure hydraulic drilling rigAM-G150Y Crawler DTH Drill,central air pressure hydraulic drilling rig AM-G150Y High Pressure Crawler opens hole drillAM-G150Y High Air Pressure DTH Drill Crawler open with a low energy ...