Material: Stainless steel, wear-resistant, waterproof and durable material that increases practical use and safety in mountaineering, hiking, rappelling and rescue operations. O-shaped carabiner dimensions: Width 60 mm (2.36 inches) / Length 110 mm (4.52 inches) / Net weight 165 grams (5.8 ounces), 4-piece O-shaped carabiner set weighs 660 grams / Strength 25-7-8KN. This heavy-duty, high-strength carabiner can withstand up to 2500 kg, making it suitable for mountaineering or camping. You can release the quick release with one hand without any pressure. Due to its symmetrical oval shape, it is the best carabiner for assisted climbing, which prevents the carabiner from shifting under load. It has a high-quality design with a threaded nut on the lock. It is very practical for connecting safety harnesses and protective equipment. The lockable quick release carabiner is suitable for various applications including: mountaineering, camping, rappelling, climbing, exploration, engineering protection and various outdoor activities.