China Drilling Geological Equipment ltd., is the professional manufacturer of drilling tool in china, and specializing in the design and manufacture of premium diamond drilling tools for the world engineering: geotechnical exploration, Mining exploration, Oil exploration and hydrapower station grouting project ( wireline core drilling and double-tube core drilling) 1.Drill rod: BQ NQ HQ PQ 2.Core barrel: BQ NQ HQ PQ head assembly and core barrel parts 3.AQ BQ NQ HQ PQ T2 T6 etc. Diamond core bit, reaming shell & shoe bit ( syn. and surface-set, PDC) 4.Drill tool: hoisting plug water swivel overshot outer tube & inner tube wrench foot clamp etc.