Vertical caving terminology and methods > Rigging methods and equipment
A type of anchor that is semi-permanently bolted into the wall using a bolt that gets wider when you tighten a nut. Very strong. Nearly as good as P-hangers. The older version of these is the rawl bolt (named after Rawlbolt branded eye bolts), which have a very large eye. The hole is first drilled into the wall using an electric drill.
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