- Material and finish: A heavy-duty wheel made from high-quality 45# steel with a zinc-plated surface and fixed guide rails. The finished wheel resists deformation, offers wear resistance, high strength, good flexibility, and long durability. - Bearings and performance: Built-in double bearings provide smooth glide and stability, helping reduce vibration and noise for quiet, reliable operation. - H-shaped groove design: The H-shaped groove fits standard square tubes precisely, minimizing vibration and delivering a silent, silky-smooth rotation. - Load capacity: Robust steel construction and heavy-duty wheels support high loads, rated up to 2640 pounds. - Compatibility: Designed to fit standard square-tube frames, enabling easy integration into existing equipment and straightforward retrofits. - Use cases: Ideal for industrial trolleys on rail systems in factories, replacement wheels for square-tube workbenches or carts, and heavy-duty material handling on workshop or warehouse carts.