D8-4 Truck Front Brake Kits are designed for ultimate in braking torque and durability to fit inside of 15" to 16" rim. D8-4 four piston calipers are designed with forged billet aluminum bodies, stainless steel pistons and high-temperature seals. Kits are paired with a massive 12.19" x 1.25" rotor for maximum torque and thermal stability. Kits include, aluminum hat assemblies, brackets, hardware and Promatrix brake pads.