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Specification: Type: Double Pulley Size: M20 Material: Stainless Steel Wheel Diameter: 20mm Groove Width: 8mm Eye Diameter: 13mm Total Height: 73mm Weight: 62g Max Load: 75kg Feature: Adopting high quality stainless steel, high hardness, damp-proof, anti-corrosion, rust resistance. Delicate technology, solid design, durable and wear-proof, strong load-bearing, swiveling flexibly. Gorgeous stainless steel gloss, non-toxic, non-pollution, environmental protection. Using gravity and skating to lift. Easy to install, convenient to use.