All components are engineered to tight tolerances to help provide excellent performance. Rotor plate thickness and mass as well as the number and shape of cooling vanes are designed specifically for each vehicle platform for optimal performance and cooler operating temperatures. Dynamically mill-balanced to help provide vibration-free stops. Unique micro-finishing provides a uniform braking surface for smoother stopping. 30 000 psi tensile strength gray alloy cast iron meets stringent Brinell hardness specs and helps provide excellent heat transfer vibration absorption durability and extended life. No machining is required or coatings are to be removed. Cooling fins help direct air between the plates to help for maximum cooling and performance. For unicast rotors wheel studs and bearing races are included. All Motorcraft brake rotor designs undergo rigorous lab and real-world tests to meet strict Ford engineering standards and provide superior performance and reliability. Vehicle linkages car/truck ford excursion: 2001 - 2005 f-250 super duty: 1999 - 2004 f-350 super duty: 1999 - 2004.