... , TC shoe bit, Thin Wall Bit, core lifter, core lifter case, Core Barrels, etc.The Geotool Core Barrel is a precision instrument designed to maximise ... 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 T Series Core Barrel (Split Tube)