This is a Kodiak Trailer replacement integral dacromet coated 5 bolt hub and rotor. This is Kodiak part # ROTOR/HUB-10-DAC. The rotor is 10" in diameter. The hub and rotor are machined as one piece which results in a better balanced unit and a smoother ride. This hub and rotor combo are designed to fit on 3,500# capacity axles and uses a 5 on 4 1/2 bolt pattern. The hub/rotor is Dacromet coated to help resist rust in salt water environments. The studs are a 1/2-20 thread. The rotor is vented to help dissipate heat faster than a solid rotor. Kodiaks disc brake hub and rotor combination uses a 1 1/16 outer bearing (44649) and a 1 3/8 inner bearing (68149). Kodiak warranties all their dacromet coated products for 3 years.