Drilling rod: made by CNC, and multi-heat treat, with premium alloy steel BQ,NQ, HQ, PQ core barrel, ... bits, natural diamond surface-set core bit, PDC bits (core or noncoring), casing shoes, reaming shells, overshot, hoisting plug, water swiel ... ,etc. BQ NQ HQ PHD HWT drill rod, multi-heat treat, 5ft and 10ft