... With 19 years experiences. 4.Drilling depth:20-25mm. XZ-100D electric drilling machine Applications: XZ-100D electric drilling machine is a new, efficient, ... and vents so popular species for rock hardness f = 8-14 of hard rock, the hard rock. Features: It has lots of ... high efficiency. Technical Data: Borehole diameter 80-130mm Rock types of adaptation Rock, hard rock, f=8-16Bore depth 60m(Down to 20 ...