【Durable】This pulley is constructed with premium aluminum alloy with the advantages of high strength, light weight and easy portability, rustproof, high strength and durable. 【High Strength】Sturdy, clearly marked, it can bear a pulling force of about 26KN, the side plates can prevent the rope from skidding, super reliable to keep your safety in climbing. 【Stable and Smooth】Fine polishing ensures a smooth surface, providing smooth and fast rotation to greatly reduce friction. The arc suspension point effectively reduces wear. At the same time, 6 cooling holes on the front and back help to dissipate heat effectively. 【Hole Diameter】The small hole is 12mm, the large hole is 14mm, suitable for ropes with a diameter of less than 12mm. Internal concave pulley with smooth surface. Perfect for climbing, also excels in other uses like hauling, transportation, etc. 【Inspection】 For safety, we recommend checking for cracks, deformation, erosion, etc. before each use, check whether the pulleys