Ice screw
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Ice screw - A screw used to protect a climb over steep ice or for setting up a crevasse rescue system. The strongest and most reliable type of ice screws are the modern tubular ice screws which range in lengths from 10 to 23 cm. The approximate strength rating on a modern tubular ice screw is around 10kN. The older type of screw that is rarely used nowadays is a pound-in ice screw. Instead of screwing these into the ice you would pound them in with the hammer on your ice tool and then screw them out to remove them. The pound-ins have been largely replaced by modern tubular ice screws that are stronger and easier to use.
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