You're looking at one of the strongest aluminum carabiners in the world. At 31 kN, it's wicked-strong and represents the strongest and most durable design in basic functional climbing carabiners. Through ISO Cold Forging, material is put exactly where it will render the strongest design possible for a carabiner of its size and materials. Specifications: 1 kN = 225 lbs of force Strength Closed: 31 kN