... produce a wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ) ... assemblies, synthetic diamond core bits, natural diamond surface-set core bit, PDC bits (core or noncoring), ... , overshot, hoisting plug, water swiel, wrench. 1. Drill rod: BQ, NQ , HQ, PQ2. Core barrel: ... reaming shell & shoe bit (syn. and surface-set, PDC)4. Drill tool: hoisting plug, water swivel, overshot, outer ...