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Black Diamond's VaporLock Screwgate Carabiner checks in under two ounces and is best used for alpine climbing or setting up anchors. Used with a belay device, the VaporLock's unique shape increases friction while rappelling with twin or half ropesand is compatible with munter hitches if you're using ropes skinnier than 9. 5mm. Black Diamond designed this carabiner with a keylock nose for snag-free convenience.