... ,tap for wireline drill rod(include heavy duty),to the tube will not hurt China Drilling Geological Equipment ltd., is the ... and hydrapower station grouting project ( wireline core drilling and double-tube core drilling)1.Drill rod:BQ NQ HQ PQ 2 ... , PDC)4.Drill tool: hoisting plug, water swivel, overshot, outer tube & inner tube wrench foot clamp etc.