Includes: (1)- Pair Dexter GalvX Coated Vented Trailer Disc Brake assemblies. 6 bolt on 5.5" bolt circle. Hubs are pre greased with bearings for easy installation. (1)- #80327 add-on Flexible brake line kit with all mounting hardware. 2 - inner bearing-#25580 1-3/4" 2 - outer bearing-#15123 1-1/4" 12-1/2" wheel nuts, 2-grease-seals, 2-grease caps with plugs