Vented disc brake rotor will accept 13" to 15" wheels.  It has a 3750Lb max capacity. Also it has a 5 on 4.5 bolt pattern and an L68149 inner bearing as well as an L44649 outer bearing comes pre greased with bearings, seal and dust cap. Brake rotor can also function as an idler hub if no brake caliper is present. Fits most 3500lb axles. Dexter UFP markets these as 10 inch but they actually measure closer to 9.75 inches.