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split-ring lifter

A hardened steel having an open slit, an outside taper, an inside or outside serrated surface. In its expanded state, it allows the core to pass through it freely, but when the drill string is lifted, the outside taper surface slides downward into the bevel of the bit or reaming shell, causing the ring to contract and grip tightly the core which it surrounds.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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