API Standard BQ NQ HQDrilling Rig Tools , Wireline Drill Rods For Exploration Specifications Drilling Rods Size O.D I.D mm mm AQ 44.7 37.3 BQ 55.7 46....
HQ PQ Wireline Drilling Core Barrel For Exploration API Standard Specifications International Standard Q-series Core Barrels and Drill Rods bq nq hq ....