... large torque, high efficiency and convenience for use. This Hydraulic Engineering Drilling Rig Machine has good performance,with large torque, high efficiency and ... coal mine silo and national defense project.This drilling machine is driven by hydraulic pressure, being double layer chassis type. The upper ... )43.8,14.6,10.2,7.0Quality(t)10 Hydraulic Engineering Drilling Rig Machine KP2000A