An autoblock is a rope device that slides freely over the rope during a controlled descent, but jams in the descender in the event of a sudden drop or loss of control, stopping the descent. This prevents uncontrolled falls in the event of an accident in which the abseiler loses control of the rope.
- "How to Tie and Use an Autoblock Knot for Climbing". Retrieved 2015-04-24.
- "6-Step Guide to Rappelling with an Autoblock Backup". Retrieved 2015-04-24.
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