... 2.easy to operate, 2.strong torque,high drilling efficency The most stable mobile hydrogeologic drilling rig AKL-S-400 1.Features ... two drilling technology in various geological conditions construction, overall for the pulling type, mechanical drive, some hydraulic control, overall rigs, hydraulic ... condition : 5.65*4.15*16.7Weight (t)9.4 The most stable mobile hydrogeologic drilling rig AKL-S-400