NQ surface set Diamond Bit NQ diamond bit/ NQ diamond core bit (NQ impregnated diamond bit, NQ surface set diamond bit)we can provide1. AQ rod, BQ rod, NQ rod, HQ rod, AW rod, 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, HQ3, PQ3, TNW, NMLC, HMLC, T2 46, T2 56, T2 76, T2 86, T2 101, T6 131, T6 146...)3. ...