Size & Capacity: 4" diameter, 1 13/16" thick, heavy-duty steel wheel with double-sealed bearings, supports up to 3500 lbs. Perfect for large gates and inverted V-track doors. Maintenance-Free: V-groove steel wheel with high-temp sealed bearings; safe for powder coating, no maintenance or lubrication needed. Easy Install: Bolt directly to 2" thick gate frames with external bracket; welding optional. Simple and flexible setup. Corrosion-Resistant: Galvanized wheel and bracket resist rust, suitable for indoor/outdoor use. Versatile Use: Ideal for sliding gates, rolling doors, towing, gym equipment, and moving heavy loads on V-tracks.