Dynapro Radial Sprint Inboard Kit Features: A fully engineered bolt-on brake system for sprint car quick change rears with 3.00 x 46 splined axles. With titanium or Super Alloy.810 vented discs and a newly designed dynamic mount rotor axle clamp, are the lowest rotating weights available for Sprint racing. • The lightweight advantages of the titanium rotor are fortified with the high durability, long wear, and superior heat control properties of advanced PolyMetallic coating technology. • Forged billet DynaPro radial mount calipers with Composition Metallic pads, produce superior stopping power and consistent fade-free response. Kit includes Axle Clamp with Dynamic Mount Rotor Adapter assembly with T-nuts and Radial Mount Bracket and mounting hardware.