Our drill rods are all manufactured by CNC machines and made of high quality alloy.3m ... drilling)We produce a wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ) and assemblies ... barrel: BQ,NQ,NQ2,NQ3,HQ,HQ3,PQ , PQ3 head assembly and assemblies3. AQ,BQ,NQ,HQ,PQ, T2, ... & shoe bit (syn. and surface-set, PDC)4. Drill tool: hoisting plug, water swivel, overshot, outer tube & inner ...