Skelang 2-Pack Box Rail Hnager, Double Wheel Rail Hanging Trolley, Trolley Hanger for Sliding Barn Door, Total Load Capacity 441 Lbs

The box rail hanger is made of steel, coated with a layer of zinc to prevent from rust and corroption | Measure 4.33 x 1.54 x 4.76 inches (LxWxH); wheel diameter is 1.81 inches, threaded bolt diamater is 0.47 inches | The robust construction makes a total load capacity 441lbs, with four smooth rolling wheel, it's easy to hold and slide heavy duty sliding door | Used with box rail, fitting 1-3/4" x 2-1/4" (WxH) box rail, compatible with National Hardware #5114 or #5116 box rail | Great for carrying sliding door, barn door, hoisted porject