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Features: Made of high quality material, these pulleys are durable, sturdy and wearable. Internal lubrication grease, smooth operation, good mute effect. U-shape groove design, smooth surface reduces friction. There are total 4 pieces of pulleys in one set that you many use for many projects. Widely used in doors and windows to track and drive mechanical equipment. Specifications: Model: 0840UU Type: U-groove Material: Metal, plastic Color: Black Inner Diameter: 8mm/0.3in Outer Diameter: 40mm/1.6in Thickness: 20.7mm/0.8in Quantity: 4pc Weight: 109g(approx.) Package Includes: 4 x Pulleys