... wireline core drilling and double-tube core drilling)We produce a wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ ... (core or noncoring), casing shoes, reaming shells, overshot, hoisting plug, water swiel, wrench. 1.Drill rod: BQ, NQ , HQ, PHD, ... PDC)4.Drill tool: hoisting plug(standard and heavy duty), water swivel(compact plus and standard), overshot, outer tube & inner ...