... diamond core bits, natural diamond surface-set core bit, PDC bits (core or noncoring), casing shoes, reaming shells, overshot, hoisting plug, water swiel, wrench. 1.Drill rod: BQ, NQ , HQ ... : 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 & shoe ...