ZGYX-420 drilling rig equipment 1,The industrial standard of the crawler drilling rig. 2, The mobile drilling rig drill 3,000T Feature:It adopts double cycloid motor and shock proof rotary head, reduces the fuilure rate of the steel ball motor and the large volume, greatly enhances the torque of the drill and enlarges the drilling hole range.1, Fast delivery . Within 20 working days. 2, Package: ...