... We produce a wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ) and assemblies, synthetic ... , reaming shells, overshot, hoisting plug, water swiel, wrench. 1.Drill rod: BQ, NQ , HQ, PHD, BT, NT, HT ... & shoe bit (syn. and surface-set, PDC)4.Drill tool: hoisting plug(standard and heavy duty), water swivel(compact ... ), overshot, outer tube & inner tube wrench, foot clamp,etc.