skelang 4 pcs 2" u-type groove wheel heavy duty rigid caster with bracket for inverted track, rolling gate, industrial machines, wire rope rail, loading capacity 660 lbs skelang <b>u-groove wheel is especially applied to the round tube track.</b> galvanized on the steel <br> surface, it is rigid strong and durable to load up to 660 lbs. fits to 3/4" round tube rail, the <br>u-shaped groove decreases friction of sharp sided track. used widely to inverted track, yard gate, <br>rolling gate, patio sliding gate, industrial machines, wire rope rail device, containers racks, baby gate, dog gate. <br><br><br> <b>specifications:</b><br> <b>material: </b> galvanized steel <br> <b>wheel diameter:</b> 2”<br> <b>loading capacity: </b> 660 lbs <br> <b>package includes:</b><br> 4 × u-groove wheels