Features: Made of aviation aluminum and magnesium alloy. For rope as much as 12mm diameter. Static tension: 20KN, Rolling tension: 10KN. Used for climbing, rescue, aloft work, engineering, etc. It can't be used to cross river, cableway and other fast projects. Specifications: Material: Aviation aluminum and magnesium alloy Color: red, yellow, blue (color randomly sent) Rope: Max. 12mm Static tension: 20KN Rolling tension: 10KN Dimension: 8.2 * 4.5 * 3.5cm / 3.2 * 1.8 * 1.4in Weight: 90g / 3.2oz Package List: 1 * Fixed Single Pulley