Clutch Masters Twin Disc 8.50 inch Race Clutch Kit | 2006 - 2008 Audi RS4 (02053-TD8S-X)Twin Disc 8. 50 inch Race Clutch Kit by Clutch Masters The 850 series is a larger diameter assembly, which is designed for high horsepower applications. The 850 Series has a higher holding capacity, less clutch chatter, and a smoother engagement compared to the 725 Series. The 850 series Twin disc will accept one sprung disc creating a slightly smoother engagement compared to two rigid discs. Features Aluminum Cover Assembly with attached Diaphragm