... , BW rod and casing2. Diamond core bits for exploration mining and dam drilling grouting; (They are the AQ, BQ, NQ, HQ, PQ, BQ3, NQ2, NQ3 ... , T6 146...)3. Diamond reaming shells for exploration mining and dam drilling grouting; (They are the AQ, BQ, NQ, HQ, PQ, BQ3, NQ2, NQ3 ...