... 4. Drill through hard stratum, etc Portable type water well drilling machine Model No.: ZL300-48 A: Main machine ... . ApplicationThis machine mainly used for farm irigation and water well drilling, drilling diameter is 70-300mm ,and drilling depth ... Economical. It can be called the most economical water well drilling machine.The technical parameter: Drilling depth60-80mDrilling diameter70-300mmPower ...