... ( wireline core drilling and double-tube core drilling)We produce a wide range of drilling tool including drill rod, wireline core barrel (AQ ... -PQ) and assemblies, synthetic diamond core bits, natural diamond surface-set core bit, PDC bits (core or ... satisfied service.1.Drill rod: BQ, NQ, HQ , PQ , NT, HT casing tube: BW, NW, HW, HWT2.Core barrel: BQ NQ ...