Redesigned with an optimized shape and the snag-free benefits of Black Diamond HoodWire Technology, the 1-ounce, hot-forged Black Diamond Oz is still the best way to lighten you're rack.. . Patent-pending stainless steel wire hood design provides snag-free keylock functionality. New optimized shape with hot-forged construction. Same size and clip-ability as the Black Diamond Neutrino Carabiner, but 8 grams lighter. Does not freeze up in alpine conditions.