This rear system features the 6S 6-piston Monoblock caliper mounted to a 15 inch 2-piece slot, drill, zinc plated rotor. Baer systems include calipers that have D.O.T. compliant dust and weather seals. Using NAS high grade stainless hardware for our pre-assembled 2-piece rotor. The 6S and 6R R-Spec calipers are Baers Flagship offering, and are built out of a single piece of US sourced 2618 forged aluminum.Fitment: