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Petzl - Ascension
(Get this price if shipping outside EU)
The gold standard in hand jammer style ascender.
Large, comfortable handle and easy to fit cam mechanism means that operation is practical using the largest and warmest of gloves.
For climbing purposes an Ascension and a Gri-Gri will get you up and down lines efficiently and are worth leaving tied to the end of your Pembroke abseil line so escape is painless if the climbing proves too hard or the tide rises too quickly!