For Use In Rock/Ice Climbing, Rappelling, Rescue Swings, And Other, Black ?UIAA Certified Heavy Duty: This climbing carabiner is UIAA certified (Certification No.: USA 20-5611) with weight limit at 25KN (5620 lbs) for major axis, and at 7KN(1573 lbs) for minor axis and locking gate ?Auto Locking Caribeaners: these aircraft grade aluminum climbing carabiners are great for all activities like rock climbing, ice climbing, rappelling, rescue, swing, aerial yoga, camping and hiking etc. ?One Hand Operation: with the twistlock design, you can easily operate this rock climbing carabiner with one hand. With a simple twist to the barrel and push against the spring load, it will open. Once you release the spring load, it'll lock automatically immediately ?Super Lightweight: Weighs only 2 oz each, these ice climbing carabiners are prefect for minimizing the weight of your gear during any adventure ?Durable and Rustproof: Made of aircraft grade aluminum, you'll enjoy using these durable and rustproof large climbing carabiners for long time