... 3,Drilling rod diameter 50 HGY-300 Water Well Drilling MachineIt is widely used in the ... prospecting, railway, road, port, bridge, water conservancy and hydropower, tunnel, well, industrial and civil construction, geological exploration, large diameter ... transmission case and shifting structure. Technological Data of Drilling Rigs: ModelHGY-300 Water Well Drilling MachineDrilling depth( m)300Drilling ...