High grade 420 stainless steel replaceable outer bands Billet aluminum CNC-machined inner carriers Cross drilled bands for increased ventilation Blanchard ground bands ensure precise and even tolerance Fixed rotors Drilled for standard H-D bolt pattern 3-1/4" x 5" x 5/16" Rotor carriers are counterbored with 2.22" I.D. Will fit 84-99 applications if 351-740, reducer spacer and PM calipers is used