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.