... of drilling tool including drill rod, wireline core barrel (AQ-PQ) and assemblies, synthetic diamond core bits, natural diamond surface-set ... core bit, PDC bits (core or noncoring), casing shoes, reaming shells, overshot, hoisting plug, water swiel, wrench. 1. Drill rod: BQ, ... shell & shoe bit (syn. and surface-set, PDC)4. Drill tool: hoisting plug, water swivel, overshot, outer tube & inner tube ...