... barrel demension: N Series Wireline Double Tube Core Barrels:Wireline double core barrels are primarily used in deep coring. With an ... especially mining applications. Due to their thin kerf, these core barrels provide rapid penetration. Available in diameters 46, 56, 66, ... suitable for underground mining applications. T6 Series Double Tube Core Barrels:These are a continuation of the T2 series, but ...