ZR80 Rotary Drilling Rig for Piling 1. crawler type rig 2. rotary drilling way 3.high quality and best price 4.easy operate ZR80 Rotary Drilling Rig for PilingMain Features:1. The drilling depth is 45m,and the drilling diameter is 600 to 1500mm.2. Can drill sand,sand pebble and gravel,etc.3. It is of small volume and weight,very flexible and convenient to use.4. Hydraulic system,easy to operate ...