Forged Billet Hat Mount Hubs are made from premium grade alloy billets are forged into shape under high heat and pressure, then CNC machined for precise fit on each spindle application. Intended for use with used with aluminum mounting hats for Hubs are either single or double drilled from 5 on 4.50" up 5 on 5.00" wheel lug patterns depending on part number. Hubs include bearing races and screw-on aluminum caps.