F1 Racing Stage 1 Clutch Kit F1-51008R0-SS Premium organic friction material for high heat tolerance, quick recovery, good friction and long life Heavy-duty sprung center unit boasts heat treated springs and retainer rivets for the maximum power and durability. Features induction hardened diaphragm, CNC machined castings, stronger drive straps and rivets Horsepower Rating: 310 HP, Torque Capacity: 302 ft/lbs Disc OD: 240mm, Spline: 24