Forged Superlite 4 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 an Super Alloy .810 vented disc and a newly designed dynamic mount rotor axle clamp, are the lowest rotating weights available for Sprint racing. • The lightweight advantages of Wilwood Sprint rotors are fortified with the high durability, long wear, and superior heat control properties of advanced materials. • Forged Superlite 4 Radial Mount calipers with BP-40 pads, produce superior stopping power and consistent fade-free response. Kit includes Axle Clamp with Dual Mount Rotor Adapter with T-nuts, radial mount bracket assembly and mounting hardware.