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Petzl designed its Vertigo WL (Wire-Lock) Carabiner to specifically meet the needs of via ferrata. Its Wire-Lock locking system makes the Vertigo very easy to lock and unlock, making it excellent for passing intermediate anchors on via ferrata or setting up an anchor on a route. The keylock nose and large gate opening ease clipping and unclipping by eliminating any snags, and the ergonomic shape gives an excellent grip. Petzl made this carabiner out of aluminum, stainless steel, and nylon to stand up to intensive use over a long period of time.