Size and Load Capacity: 4” (102mm) diameter, 1 13/16" thick, with double-sealed bearings inside the rolling wheel, capable of supporting up to 3500 lbs. Suitable for large driveway gates, security sliding doors, and inverted V-track sliding doors. Maintenance-Free Design: The V-groove gate wheel is made of sturdy steel, providing durability and longevity. It includes high-temperature sealed bearings. No greasing - no maintenance required for long-term stable operation. Easy to Install: The V-groove sliding gate wheel comes with a welded bracket box that can be directly welded to the gate frame. The installation process is simple and quick. This heavy-duty gate wheel model will effectively replace your old wheels, extending the lifespan of your gate system for both indoor and outdoor use. Corrosion-Resistant: ：The wheel is well-galvanized, and the bracket box is powder-coated to resist rust and corrosion, making it suitable for both indoor and outdoor applications. The bracket box also protects the wheel, ensuring smoother operation and reducing future maintenance needs. Versatile Applications: Suitable for all sliding gates, the V-groove wheel saves time and effort, helping you transport goods efficiently. It is the perfect replacement for sliding gates, rolling doors, towing, rolling, gym equipment, moving heavy equipment, and objects on V-tracks.