... in the design and manufacture of premium diamond drilling tools for the world engineering: geotechnical exploration, Mining exploration, Oil exploration and ... wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ) and assemblies, synthetic diamond core bits, natural diamond ... BW, NW, HW casing tube: BW, NW, HW, HWT2.Core barrel: BQ,NQ,HQ,PQ , head assembly and assembly 3.AQ ...