Feature:*Dual Bearings for Smooth Rotation: The idler pulley features two small ball bearings, ensuring soft rotation and decreasing friction force.*High Quality Galvanized Steel - Made of and corrosion-resistant galvanized steel, these pulleys are constructed to last. The burr-free protects either the rope and your hands.*Versatile Design - With a small pulley size of 55 x 31 x forty one mm, a curler diameter of 31 mm, and a maximum groove width of 15 mm, these pulleys are compatible for ropes ranging from 1-8 mm. They can handle a most load of 200 kg and a security load of 50 kg.*Multiple Uses - These pulleys are perfect for steering ropes, lifting objects, working winches, and even gentle sliding doors. Their versatility makes them a invaluable addition to any toolkit.*Set of four Pulleys - This kit entails 4 pulleys, providing you with adequate suggestions to your diversified tasks and needs.Specification:Product name: Heavy responsibility track pulleyProduct material: SteelScope of application: used for sliding doors, door and casement tracks, rail machine parts, etc.Product type: V typeFrame thickness: 2.5mmPulley diameter: 31mmApplicable rope: 1-8 mmSafe load: 50 kgMaximum load: 2 hundred kgPacking list:4* pulleysNote:1. The real color of the thing may be slightly diversified from the images shown on online page brought on by many points comparable to brightness of your computer screen and light-weight brightness.2. Please allow slight handbook measurement deviation for the data.