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Features: 1. The inside is provided with a spring for easy one-hand operation. 2. This pulley is constructed with premium aluminium, anti-rust, high strength and durable. 3. Suitable for 8-12mm rope. 4. Fine polish ensures sleeks surface, providing smooth and quick rotation to greatly reduce friction. 5. Widely used in mountaineering, hoisting, caving, aerial work, heavy objects, etc. Specification: Material: 7075 aviation aluminum Pull force: 4KN (about 400KG) Applicable rope diameter: 8-12mm Pulley type: ball bearing structure Scope of application: mountaineering, hoisting, caving, aerial work, heavy objects, etc. The static tension of the pulley: 25KN Rolling force: 12.5KN Lifting force: 4KN Package List: 1 * Pulley