1,HGY-300 Drilling Machine 2,Full-hydraulic chuck or ball-type chuck 3,Widely used in exploration 4,Drilling rod diameter 50 HGY-300 soil sampling Drilling MachineIt is widely used in the construction of the projects e.g. prospecting, railway, road, port, bridge, water conservancy and hydropower, tunnel, well, industrial and civil construction, geological exploration, large diameter boring pile ...