Features: Heavy-Duty Construction: Made from thickened stainless steel with a galvanized-surface, ensuring superior durability and resistance to rust, wear, and heavy loads Dual Bearing System: Features double bearings for smoothing, low-friction rotation, enhancing efficiency and longevity in lifting and sliding applications Versatile Compatibility: Available in 4040mm and 5050mm sizes with three mounting options (Lifting Chain, Lifting Rings, Flat Tile), making it adaptable to various angle iron tracks and setups Precision-V-Groove Design: The triangles steel V-groove ensures secure tracking and alignment on angle iron rails, reducing slippage and improving operational stability Multi-Purpose Use: Ideal for cranes, lifting tools, sliding-gates, and other industrial or DIY projects requiring reliable, heavy-duty pulleys systems Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Specifications: 50x50 angle iron pulleys (Lifting Chain type) 40x40 angle iron pulleys (Lifting Chain type) 40x40 angle iron pulleys (Lifting Rings type) 50x50 angle iron pulleys (Lifting Rings type), 50x50 angle iron pulleys (Flat Tile type) 40x40 angle iron pulleys (Flat Tile type) Size: 18x14.5x2cm 18.5x12.5x2cm 12.5x12.5cm 14.5x10.5cm 13x9cm 11x9cm Package List: 1X Cranes Bearing Wheel