Centerforce designed this 384161 I and II Clutch Friction Disc for 1932-1992 Buick, Chevy, Ford, Oldsmobile and Pontiac crate engine and car applications. This clutch disc offers outstanding holding power and durability for street/strip and performance usage while maintaining a light pedal effort. The single disc distributes full face clamping force evenly on both the pressure plate and the flywheel sides to concentrate clamping pressure and increase clutch holding-capacity. This disc is made for Centerforce I and II pressure plates. Centerforce 384161 I and II Clutch Friction Disc Features: Input Spline Quantity: 26 Input Shaft Diameter: 1.125 in. Disc Diameter: 10.400 in. (264mm) Disc Type Sprung Solid: Sprung Disc Type: Full Face Disc Material: Organic Sold individually From mild to wild, Centerforce is The Performance Clutch!