... in exploration 4,Drilling rod diameter 50 HGY-300 soil sampling Drilling MachineIt is widely used in the construction ... Sudan, Iran, South Korea, Costa Rica etc.Features of soil sampling Drilling Machine:1) Wide range of suitable rotary speed ... clutch, transmission case and shifting structure. Technological Data of soil sampling Drilling Machine ModelHGY-300 Drilling MachineDrilling depth( m) ...