Type: Drilling Rig 1, Drilling Depth: 30 meters 2, Drilling Diameter: 80-138 mm 3, Drill Rod Length: 3000 mm 4, ISO9001:2000 ZGYX-420 Crawler Bore Hole Stone Drilling Rig Feature:1, This is new model, which has enhanced the strength of each part based on the drill of ZGYX-2600 Driling Rig.2, It adopts double cycloid motor and shock proof rotary head, it is greatly enhances the torque of the drill ...