... .hole depth:20-150m GDY-100 Portable engineering drilling rigGDY-100 portable engineering drill is a kind of multi-use ... 20~150m. The drill is used broadly for the engineering geological reconnaissance in industrial and civil architecture,energy,traffic ... used in drilling minor diameter foundation holes. Technical Data: Basic Parameters Drilling depth25,135,175mDrilling diameter300,76,46mmGross weight ...