Southwest Wheel Pair 12" X 2" Self-adjusting Electric Brakes with Hardware Pair of 12" x 2" self-adjusting electric brake assemblies. Contains 1 left and 1 right brake assembly. 5 Hole mounting for 5,200 lbs., 6,000 lbs., and 7,000 lbs. trailer axles. Comes with mounting bolts, nuts, and lock washers Works with Al-Ko, Dexter, Lippert,and Quality Trailer Axles Factory Boxed.