• Premium Vented Rotor Design: High-quality cast iron construction with vented cooling passages helps reduce brake fade and promotes longer rotor life., • Dual Bolt Pattern Compatibility: Features both 5 on 4.5″ and 5 on 4.75″ patterns, making it ideal for Ford, Mopar, Chevy, and GM rear axle applications., • Fits Multiple Axle Flange Sizes: Designed for axle flange diameters up to 6-1/4″, providing broad compatibility for custom and restoration builds., • Machinable Center Hole: Rotor includes a 2.78″ center bore that can be machined larger if required for specific axle or hub configurations.