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The Edelrid HMS Strike SafeLock Locking Carabiner has two independent, automatic locking mechanisms to make your climbing adventures doubly safe. Its SafeLock device consists of an intelligent slide-gate locking mechanism and a spring bar that also prevents cross loading. The keylock nose makes clipping and unclipping a breeze. This versatile HMS carabiner is useful anywhere in the climbing world, from top ropes at the gym to roping up on glaciers.