Our drill rods are all manufactured by CNC machines ... drilling)We produce a wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ) and assemblies, ... reaming shells, overshot, hoisting plug, water swiel, wrench. 1. Drill rod: BQ, NQ , HQ, PQ2. Core barrel: BQ,NQ ... shell & shoe bit (syn. and surface-set, PDC)4. Drill tool: hoisting plug, water swivel, overshot, outer tube & inner ...