Spec:Features:This is forged with high strength metal material, unbreakable and wearable, and to use.Using the friction between the rope and the wheels to adjust falling speed via the brake, can help you climb upwards or downwards safely.With a auto lock gear that offers to you to prevent you from falling down when you climb downwards.Suitable for 9-12mm rope, easy to use. 15KN duty, suitable for most people to use. Used for rappel system, also suitable for fire , working aloft, etc.Specification:Material: Aluminum Color: As picture shownMaximum Breaking Strength: 15KN (1500kg)Hole Diameter: 15mm / 0.59inchSuitable for Rope Diameter: 9-12mm / 0.35-0.47inchSize: Approx. 9.5*7.2cm / 3.74*2.83inchWeight: Approx. 234gPackage List:1 * Climbing Descender