Wilwood Forged Dynapro Big Brake Kit - 5x5 Hub/12.19in Drilled & Slotted Rotor/ Black Caliper- FrontDynaPro 6 forged billet calipers are combined with 12. 19 diameter rotors for this group of traditional non ABS spindles on American muscle cars and vintage rods. The enhanced brake capacity and pad performance of the six piston calipers provide an intermediate level alternative to the bigger six piston kits. These kits are specially designed for 5 x 5. 00" bolt circle wheels. DynaPro 6 kits compliment wheel, tire, and suspension upgrades on all types