Milwaukee Twins 11.5 Round Hole Rear Brake Rotor For Harley This Milwaukee Twins 11.5 Rear Polished Rotor is made from 420 stainless steel and has a drilled braking surface to help dissipate heat produced buy brake pad friction. Stylized circle design and countersunk bolt holes. Features: 420 stainless steel construction Polished Drilled braking surface increases heat dissipation and performance in wet or dry conditions Replaces OEM 41797-00