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Kjeragbolten, a large chockstone or suspended boulder in Norway.
Climbing nut in use.


chock +‎ stone. The climbing sense derives from the wedges' use as artificial chockstones.



chockstone (plural chockstones)

  1. A stone, ranging in size from a boulder to a pebble, which has become wedged in a vertical fissure or cleft.
    • 2004, Aron Ralston, 127 Hours: Between a Rock and a Hard Place, Simon and Schuster, published 2011, page 68:
      In these coldest hours before dawn, from three until six, I take up my knife again and hack at the chockstone. I continue to make minimal but visible progress in the divot.
  2. (climbing) A metal wedge or nut, threaded on a wire, used in rock climbing for protection by wedging it into a crack in the rock.
    Coordinate term: piton

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