... Our drill rod with high quality alloy steel, and heat-treated. Can supply different drill rods ... bits. Size Available:"Q" Series: BQ, NQ, HQ, and PQ."WJ" Design: AWJ, BWJ, NWJ, KWJ, HWJ ... drill rod, wire line core barrel (AQ-PQ) and assemblies, synthetic diamond core bits, natural diamond surface-set ... core bit, PDC bits(core and non-coring),casing shoes, reaming shells, overshot, ...