... as it is possilbe to achieve with rotary core drilling equipment. It is not uncommon for ... report 98% + core recovery in the most difficult formations.Size available:Q series Core Barresls: AQ, BQ, NQ, HQ ... , PQ, NQ3, HQ3T series Core Barrels: T2-56, T2 ... -66, T2-76,T2-86, T2-101, T6-131 Core ...