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Specification: Product Name: Single Pulley Block Size: M20 Color: Silver Tone Material: 304 stainless steel Wheel Diameter: 20mm Groove Width: 8mm Swivel Ring Width: 13mm Overal Length: 73mm Max Load Bearing: 75kg High Quality: Made of durable hard stainless steel, manufactured in strict process, strong, reliable, waterproof, anti-rust, anti-high temperature, corrosion resistance, will provide you the most convenience for work. Use: Simple and practical roller, using gravity and skating for lifting work, designed for use with rope or cord in indoor and outdoor applications to hang weight things or lighten load. Advantage: 360 degree swivel top ring for ease rope handling, smooth roller provides great rope traverse. Application: Widely used in tractive effort of steel wire rope or other rope tools, suitable for the production of various small cranes, fishing system and pulley model. Note: Manual measurement, please allow 1-3mm errors. Package: 2pcs M20 Stainless Steel Single Pulley Block