... include core lifter,lifter case,stabilizer,landing ring,outer/inner tube, adaptor coupling,locking/C China Drilling Geological Equipment ltd., is ... hydrapower station grouting project ( wireline core drilling and double-tube core drilling)We produce a wide range of drilling ... duty), water swivel(compact plus and standard), overshot, outer tube & inner tube wrench, foot clamp,etc. Core Barrel BQ NQ HQ ...