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【Quality Materials】: Crafted from thickened steel and coated with colored zinc for rust and corrosion resistance, ensuring long-term use. 【Smooth Operation】: Built-in ball bearing design ensures fast rotation, smooth operation, and minimal noise. 【Strong Bearing Capacity】: The steel plate construction of track rollers withstands heavy loads without deformation, providing durability against wear. 【Model Specifications】: The set includes 4 pulleys with a wheel diameter of 32mm and bracket dimensions of 32*56mm. 【Wide Range of Uses】: These pulleys are suitable for sliding doors, garage doors, ropes, and various mechanical equipment, fitness gear, and pulley systems.