... NQ HQ PQ Drill Rod 3.EW,AW,BW,NW,HW Drill Rod 4.Tapered Drill Rod Core Drill RodDrill Rod ... & Coupling (AQ,BQ,NQ,HQ,PQ Drill RodEW,AW,BW,NW,HW Drill Rod )Geotool drill ... shown on the following specification table all drill rods are manufactured with a parallel wall.Old ... Series drill rods E,A,B,N, are available ...