... diamond drilling tools for the world engineering: geotechnical exploration, Mining exploration, Oil exploration and hydrapower station grouting project ( ... drilling)We produce a wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ) and assemblies, synthetic ... reaming shells, overshot, hoisting plug, water swiel, wrench. 1. Drill rod: BQ, NQ , HQ, PQ2. Core barrel: BQ,NQ,NQ2 ...