core lifter & core lifter case

Wire-line core drilling tools can liftcore from drill rods without picking up coring system,A complete set of wire-line drill tools include: core barrel assembly, overshot assembly,drill rods, holding dag,hoisting plug,circle wrench etc.It has some advantages such as high penetration rate, high core recovery ratio, long bit life andlower labour intensity.The advantages can get more clear with the increasing of drill hole depth.