... )We produce a wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ) and assemblies, synthetic diamond core ... , reaming shells, overshot, hoisting plug, water swiel, wrench. 1. Drill rod: BQ, NQ , HQ, PQ2. Core barrel: BQ,NQ,NQ2,NQ3 ... plug, water swivel, overshot, outer tube & inner tube wrench, foot clamp,etc.