Core barrels available in proven latch-spring design and updated positive latch version Overshots available in safer version with heavy-duty lifting dogs for surface application and pump-in seals for underground versions Conventional triple tube core barrels for near 100% volumetric recovery of core upto 8 inch diameter WIRELINE CORE BARRELS Double Tube System Surface AWL, BWL, NWL, NWL2", HWL, PWL Underground BWL-U, NWL-U, HWL-U Triple Tube System (Upto 6m Long Core)