Keep You Safe: It uses the friction between the rope and the Descender device to slow down the descent or brake. Extra thick with ears and belay slot will keep your safety, even in a rescue or emergency situation. Great Grip: Thorn and groove design can automatically dispose mud and provide a good grip even the rope is covered with mud or ice, any operator can easily operate the cam system with his thumb. keep from fatiguing even in a long time single rope climbing(even with thick gloves). High Strength Alloy: AOKWIT climbing descender use Aviation Light – mg alloy is characterized by high strength, light weight and easy to carry.Weight limited:140kg/ 308Ib,Breaking strength 8.5KN. Tension: 4KN, for 8-12MM Rope.