... ,and made of high quality alloy. 3m &1.5m, multi-heat treat. include BT NT HT China Drilling Geological Equipment ... hoisting plug, water swiel, wrench. 1.Drill rod: BQ, NQ , HQ, PHD, BT, NT, HT and BW, NW, HW casing tube ... : BW, NW, HW, HWT2.Core barrel: BQ,NQ,HQ,PQ , head assembly and assembly 3.AQ,BQ,NQ ... ,HQ,PQ, T2, T6 etc. Diamond core bit, reaming shell & ...