1,HGY-300 Drilling Machine 2,Full-hydraulic chuck or ball-type chuck 3,Widely used in exploration 4,Drilling rod diameter 50 ... South Korea, Costa Rica etc.Features of soil sampling Drilling Machine:1) Wide range of suitable rotary speed to meet ... and shifting structure. Technological Data of soil sampling Drilling Machine ModelHGY-300 Drilling MachineDrilling depth( m)300Drilling rod diameter.(mm)Φ50 ...