It’s finally here...after a solid year of R&D, Circle D's Custom Billet 4-5-6 hub & shaft assembly is ready for you. The shaft is CNC machined from 300M material and the clutch hub is 4140 material, then heat treated and stress relieved for maximum durability. This is not just an OEM replacement, it uses the "Super Drum" clutch pack, which is equivalent to 11 OE clutches, OE is just 6. They are Carbon based friction plates and Nitrided Steels, while also using an extra thick Apply Plate and End Plate so no compromises on coning. This is an 80% clutch apply surface area improvement over stock, huge improvement.