The handiest of ascenders, the minuscule Tibloc can be left clipped on the back of your harness hopefully to never be used. But if need does arise,
Petzl - Tibloc
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Petzl Tibloc, Catalog Products, Store
Petzl, Tibloc, Ascender
Petzl Tibloc Lightwieght Emergency Rope Clamp Used by Mountaineers
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Petzl TiBloc Ascender Product Information Sheet