... china, and specializing in the design and manufacture of premium diamond drilling tools for the world engineering: geotechnical exploration, Mining ... rod, wireline core barrel (AQ-PQ) and assemblies, synthetic diamond core bits, natural diamond surface-set core bit, PDC bits (core or noncoring ... and assemblies3. AQ,BQ,NQ,HQ,PQ, T2, T6 etc. Diamond core bit, reaming shell & shoe bit (syn. and surface- ...