This is a Replacement Kodiak Trailer dacromet coated disc brake rotor. Kodiak part number ROTOR/HUB-12-DAC. This brake rotor is an integral design meaning the rotor and hub are cast as one piece. The Kodiak vented brake rotor measures 12 1/8 inch outside diameter. All Kodiak rotors are 100% tested and balanced. This hub uses a 1 1/4 inch outer bearing (bearing number 15123) and a 1 3/4 inch inner bearing (bearing number 25580). Kodiak on uses rotors that are vented to help dissipate heat faster. This rotor is for use with 15 inch or larger wheels. Kodiak also offers a 3 year warranty on all their dacromet parts.