Ultra small and lightweight, The Petzl Tibloc Ultra light Ascender is a tool of many uses. This device pairs with an oval-stock carabiner for numerous self-rescue situations, creates a self-locking pulley for bag hauling, ideal for crevasse rescue, or can help a partner up a difficult pitch. It can also be used as an emergency ascender. At a mere 1.4-ounce the Tibloc is an easy gear add on a long rock, aid, or alpine climb.