Dynamic Rotor Adapter for Wilwood’s Pro Street and Drag hubs. Adapters is supplied with a 5 x 3.88” bolt circle pattern for hub mounting and a 8 x 7.00” bolt pattern for rotor mounting. Requires bolt & t-nut kit 230-14414 for rotor mounting. Made from high strength aluminum alloy with a corrosion and wear resistant Type III hard anodize finish.