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. 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 turning the screw with your fingers. SIZE:Heavy duty carabiner Length: 3.93”; Width: 2.2”; Door opening size: 0.67 inches, D-shaped ergonomic design, very suitable for one-handed operation. Quickly lock the carabiner as you climb. LIGHTWEIGHT: The carabiner clip is stamped from 7075 aviation aluminum and weighs only 59 grams (2.2 ounces). This rock climbing carabiners is a very good climbing equipment that will not add extra weight to you when climbing outdoors or climbing trees for hunting. REMINDER: For carabiners certified by UIAA, please look for the JRSGS brand. We will give you a 100% satisfactory answer to any product quality problems. Just contact us, and our service is always online. JRSGS carabiner is a rock climbing carabiner certified by UIAA, the minimum radial tension exceeds 25KN. Made of 7075 aluminum stamping, the weight is very light, very suitable for outdoor sports and various leisure activities. You are welcome to buy our products.