Wilwood Hat-Park Brake 1.91in Offset 8 x 6.50 - 12 on 10.75inThese premium grade cast iron hats make it possible to use bolt on rotors on vehicles equipped with OEM internal shoe parking brake assemblies. Each hat is a precision machined, threaded hole design for use in conjunction with through hole mount rotors. After machining, the hats are electro coated for corrosion resistance. Used for big rotor brake kits on truck, SUV, and 4WD axles with either 6 or 8 lug configurations.