Our drill rods are all manufactured by CNC machines,and ... 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, PHD, BT, NT, HT ... (syn. and surface-set, PDC)4.Drill tool: hoisting plug(standard and heavy duty), water swivel(compact plus and standard), ...