This is a used 12" Dayton-Fayette hub with 4 left hand lugs bolts on 9.44" bolt pattern. This manufacture went out of business in the late 1970's or early 1980's. Finding replacement hubs like this one are next to impossible. This hub comes with the inner and outer bearings, the grease cap, the grease seal and 4 left hand lug bolts. The ID of the hub is 12" with 2-1/4" surface for brake pad. The OD of the hub is 13" and from top to bottom the hub is 8" high. The outer bearing is #LM67048, the inner bearing is #25580 and the seal is #CR22558. This is a used hub and is not returnable so make sure it is what you need before ordering it.