1. ST-100 water well drilling rig a. the machine is equipped with crawler chassis device,easy to move with fast speed. b hydraulic oil pressure feed device,improve drilling defficiency. c. pressure gauge display the condition of the bottom of the drill hole. d drill mast controlled by hydraulic cylinder,improve the efficiency diesel engine adopt the electric starter,to reduce the labor itensity. 2. Applications of ST-100 Water Well Drilling Rig ST-100 drilling rig is mainly used for geological general investigation and exploration,road and tall buliding foundation exploration,kinds of hole in concrete structure,river levees,subgrade grouting hole,drilling and driect grouting,civil wellsand earth temperature central air-conditioner,etc.