This hub is a direct replacement for the early to mid 70"s Impala with disc brakes. Hubs include 5 x 5 and 5 x 4 3/4" bolt patterns. It is machined from 6061-T6 Aluminum and incorporates an integral rotor mount that fits the standard 8 bolt 7" bolt circle rotor. It uses stock bearings and races. This is a light weight alternative to the stock cast iron hub rotor assembly. Note: Bearings and races not included.