These 10-1/2" racing clutch discs for GM applications are the perfect choice for Hobby or Street Stock racing. Organic solid hubs. Fits 1-1/8" 10-spline shaft. Speedway developed these 10-1/2" clutch pressure plates for sportsman circle-track racers. Includes a lightweight, stock-appearing pressure plate that features a ductile iron pressure ring. Can be used with solid or sprung hub clutch discs with organic or ceCompatible with Ramic friction surfaces. Kit Includes: (1) Compatible with Chevy lightweight steel flywheel, 153 tooth, 2-piece main. (1) 10-1/2 inch pressure plate. (1) 10-1/2 inch GM organic clutch disc, solid hub, 1-1/8 10-spline. (1) ARP hevy flywheel bolts set Overall Length: 1.25" Under Head Length: 1.00" Thread Pitch: 7/16 Wrench Type: 12 Point Set of 6 flywheel bolts. (1) ARP Compatible with Chevy pressure plate bolts set Overall Length: 1.25" Under Head Length: 1.00" Thread Pitch: 3/8"-16 Wrench Type: 9/16" Hex Set of 6 pressure plate bolts. (1) Clutch alignment tool, 1-1/8 inch 10-spline. (1) SBC/BBC Compatible with Chevy Compatible with V8 extra-long bronze pilot bushing Inside Diameter: .582" Outside Diameter: 1.09" Overall Length: 1.012" Flange Width: .261" Flange Diameter: 1.26"