Best Geological/Coal mining HQ NQ Drill rods 1. ISO9001 2. High efficiency 3. ... quality 4 Super antiwear characteristic Best Geological/Coal mining HQ NQ Drill rods About Us We are a professional manufacturer ... upon your requirement. Size Avaliable: "Q" series: AQ, BQ, NQ, HQ, PQ/AQTK, BQTK, BQ3, NQ2, NQ3, NQTT, HQ3, HQTT, ... us for more detailed information. Best Geological/Coal mining HQ NQ Drill rods