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Whether it's paired with our belay device or our PAS, Petzl's Sm'D Twist Lock Carabiner makes setup quick and safe. The twist-lock gate locks itself as it snaps closed, while the keylock nose prevents snagging when it's time to remove this 'biner. And although the Sm'D is light and compact, it remains just as strong and user-friendly as its full-sized peers.