STURME heavy duty screwgate locking carabiner has UIAA Certification (Certification No. CHN 19-5541) with super strength and safety. It can hold up through a full lead climbing fall, suitable for mountaineers, rock climbers etc. The major axis strength reaches 25KN(5623 lbs), locks up automatically with the twist lock system, which makes it easy and safe to connect the protector and the belt. The screwgate carabiner size - the height: 3.92 inches, the widest width: 2.38 inches, the gate opening: 0.6 inches; the weight is only 63g. It is made of top-grade aerospace aluminum 7075, smooth. The 25KN carabiner is convenient to operate with just one hand. You can roll the lock with your thumb to unlock and open one-handed, and then you can do whatever keeps you safe or something more important with your other hand. STURME large carabiner is strong and durable, very suitable for outdoor sports, such as mountain climbing, camping, hiking, backpacking, boating, etc. But not for rappelling sports or fall protection equipment at work