Best Geological/Coal mining HQ NQ Drill rods 1. ISO9001 2. High efficiency ... quality 4 Super antiwear characteristic Best Geological/Coal mining HQ NQ Drill rods About Us We are a professional ... your requirement. Size Avaliable: "Q" series: AQ, BQ, NQ, HQ, PQ/AQTK, BQTK, BQ3, NQ2, NQ3, NQTT, HQ3, HQTT, ... Z46, Z56, Z66, Z76, Z86, Z101, Z116, Z131, Z146 B series: B36, B46, B56, B66, B76, B86, B101, B116, ...