AFCO Cast Iron Brake Hub & Rotor Flat Hybrid .813 Inches Thick 10.13 Inches Diameter 5 Inch x 5 Inch Bolt Pattern - 5/8 Coarse Studs - 9850-6505AFCO's Hybrid rotor is the first, the strongest rotor on the market, and has been trusted by 1000's of racers and chassis builders for more than a decade. Each rotor has been manufactured using premium grade alloys for superb thermal shock stability, double disked ground to ensure precise flatness, uses high strength 5 8" wheel studs installed on a 5 on 5" bolt pattern, and is rotationally balanced to reduce vibration and improve traction. For the