HGY-300 Water Well Drilling Machine 1,Full-hydraulic chuck 2,Widely used in exploration 3,Drilling rod diameter 50 HGY-300 Water Well Drilling MachineIt is widely used in the ... manufacture2. Certificate: ISO9001:20083. Export to: Africa, the Middle East, South America, Asia, Countries: South Africa, Zambia, Sudan, Iran, South Korea, Costa ...