... 500mm convenient to transport. Water Bore Well Drilling Rig (trailer mounted) SPT-300 SPT-300 is implemented with rotary table ... and consists of main and auxiliary winch, gearbox, derrick and chassis. It has advantages of hydraulic tower, variable, speed range, ... agricultural water well drilling, Hydro-geological exploration and bridge pile holes drilling. Water Bore Well Drilling Rig (trailer mounted)