Vertical caving terminology and methods > Rigging methods and equipment
A type of anchor that is semi-permanently bolted into the wall using a screw that cuts its own threads, and bites into the rock. These can be fairly small (6 mm) for limestone, or very big (12 mm) for weaker rock like compacted shale. Smaller types are generally used only for bolting. The hole is first drilled into the wall using an electric drill.
<< Through bolt, expansion bolt, rawl bolt, wedge bolt, sleeve bolt | Abalakov thread, Abalakov belay, drilled thread, drilled hole, drilled flake (sometimes "V-thread", "A-thread", or "0-thread" in ice climbing) >>
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