Carbide core bit with PDC, drilling middle to soft formation for ore or oil with API thread and other threads. Carbide PDC core bit with ... (AQ-PQ) and assemblies, synthetic diamond core bits, natural diamond surface-set core bit, PDC bits (core or noncoring), casing shoes, reaming shells, ... assembly 3.AQ-PQ, T2, T6 etc. Diamond core bit, reaming shell & shoe bit (syn. and surface-set, PDC)4.Drill tool ...