CNC-machined billet aluminum design features over twice the friction area of the stock clutch. Provide positive engagement and release. Incorporate six heavy-duty coil springs instead of the diaphragm spring; include an extra heavy-duty set of springs for higher horsepower applications. Friction plates are compatible with most primary oil. Simple bolt-on installation; requires the original clutch shell; no machining is necessary. Kits include clutch hub, drive plates, driven plates, sets of clutch springs, pressure plate and necessary hardware. Made in the U.S.A.