... for use in moderately abrasive and fra-ctured formationSize from AW , BW , NW , HW , PW , SW ( include NQ , HQ , PQ drilling ... can provide1. AQ rod, BQ rod, NQ rod, HQ rod, AW rod, BW rod and casing2. Diamond core bits for exploration ... , T2 101, T6 131, T6 146...)4. Casing shoes bits; (AW, BW, NW, HW, PW)5. DTH bits and the hammers6 ...