Southwest Wheel 5,200 lbs. Trailer Axle Electric Brake Kit Pair of 12" x 2" 6-5.5" bolt circle TruRyde hub and drums 25580 inner bearing 15123 outer bearing Pair of 12" x 2" TruRyde electric backing plates Works with Al-Ko, Dexter, Lippert,and Quality Trailer Axles Comes with bearings, 2.25" ID seals, 2.125" ID seals, lug nuts, solid grease caps, ez lube grease caps, cotter pins, spindle washers, tang washers, spindle nuts, and brake mounting washers and nuts Built for 42 spindles with a 5 hole brake flange