... and made of high quality alloy tube.3m &1.5m, with multi-heat treat, China Drilling Geological Equipment ltd., is the ... )We produce a wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ) and assemblies, synthetic diamond core ... , reaming shells, overshot, hoisting plug, water swiel, wrench. 1.Drill rod: BQ, NQ , HQ, PQ, NT, HT Casing tube: BW, NW ...