... exploration 3,Drilling rod diameter 50 HGY-300 Water Well Drilling MachineIt is widely used in the construction ... , road, port, bridge, water conservancy and hydropower, tunnel, well, industrial and civil construction, geological exploration, large diameter boring pile ... . Technological Data of Drilling Rigs: ModelHGY-300 Water Well Drilling MachineDrilling depth( m)300Drilling rod diameter.(mm)Φ50 ...