25KN Locking Climbing Carabiner Clips, UlAA Certified Rockclimbing Carabiner,Heavy Duty Carabiners Equipment,Large SizeCarabiner for Climbing, Rappelling,Hunting and Rescue1. UIAA CARABINER: Locking carabiner spindle strength 25kN (5,621 lbs), cross load 7kN, widely used in a variety of activities: climbing, downhill, cave exploration, rescue, hammock, aerial work, climbing trees, even locking large adult dog 2. KNURL NUT: The climbing carabiner upgrades the double layer knurled nut to increase the friction between the fingers and the nut. When using a heavy duty carabiner, you can easily lock or unlock the carabiner by