... drilling)We produce a wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ) and assemblies, synthetic diamond ... customers with products of outstanding quality and satisfied service.1.Drill rod: BQ, NQ, HQ , PQ , NT, HT casing tube: BW ... , reaming shell & shoe bit (syntheyic and surface-set, PDC) 4.Drill tool: hoisting plug, water swivel, overshot, outer tube & inner tube ...