1.AQ, BQ, RQ, NQ, HQ, PQ drill rod for diamond core bit 2.Material quality:E75\ ... Core bits. Size Available:"Q" Series: BQ, NQ, HQ, and PQ."WJ" Design: AWJ, BWJ, NWJ, KWJ, HWJ"W" Design: RW ... drilling tool including drill rod, wire line core barrel (AQ-PQ) and assemblies, synthetic diamond core bits, natural diamond surface-set ...