Our drill rods are all manufactured by CNC machines and made of high quality alloy tube.3m &1.5m, with multi-heat treat, China ... , overshot, hoisting plug, water swiel, wrench. 1.Drill rod: BQ, NQ , HQ, PQ, NT, HT Casing tube: BW, NW, HW, HWT, 2.Core barrel ... : BQ NQ NQ2 NQ3 HQ HQ3 PQ PQ3 head assembly ...