Check the listing for details. Dia.3" U Groove Wheel with Bracket, Round Steel Loading 485 lbs. Condition: New. Listed at 33.46 USD. What is this?This heavy duty rigid caster, made of round steel, is suitable for various heavy duty applications such as sliding gate, yard gate, inverted tracks, rolling shutters, industrial machines, wire rope rails, container shelves, garage doors, and more.What will I get?You will receive a pack of 1 groove wheels, each complete with a bracket. It fits the 4/5" round tube orbit.Color: Colored Plated;Style: U Shaped;Wheel Diameter: 75mm / 3 inch;Wheel Width: 22 x 29mm / 0.87 x 1.14 inch (inner*outer);Groove Width: 57mm / 2.24 inch;Overall Height: 90mm / 3.54 inch;Base plate size: 100 x 43mm / 3.94 x 1.69 inch;Mounting hole spacing: 90 x 30mm / 3.54 x 1.18 inchAre there any advantages of the product?Surface plated for rust prevention, the thickened steel plate enhances the load-bearing capacity for safety.