... . light weight GX-50 PORTABLE GEOTECHNICAL DRILLING RIG 1. APPLICATIONS: Geological drilling for railroad, highway, bridge tunnel, foundations ... power station, Civil and industrial buildings, also drilling anchoring hole and blasting hole etc.2. FEATURES ... Hydraulic retracting lets drill body away from the drilling hole. Hydraulic chuck, hand-powered chuck and ... GX-50 Portable Geotechnical drilling rig