ARP 2502201 Pro Series Pressure Plate Bolt Kit For Select Ford Applications Pressure plate fasteners play a key role in the performance and safety of a vehicle Manufactured from a premium grade chrome alloy that is heat-treated to 200,000 psi, which is considerably stronger than Grade 8 hardware Originally designed for NASCAR Winston Cup competition Bolt is application specific to ensure the optimum grip length, with a thread size of 5/16-18 Kits come complete with washers