4 piston design for Dirt and Asphalt Late Models, Front of Silver Crown Car or the inboard. Available in .810" or 1.250" Rotors. Features teflon coated pistons and Titanium center pin, 600 degree O-rings and internal fluid cross over passage. Staggered piston diameters to promote even brake pad wear. Piston sizes up to 2", 3 1/2" bolt centers will accept recirculators. O-Ring & Bolt Kits not included.