Genuine Al-Ko 10"x2.25" Electric Trailer Brake Assemblies (1 Right & 1 Left) Pair of 10" x 2.25" electric trailer brake assemblies with parts. 4 Hole Mounting - Comes with mounting bolts, nuts, and lock washers For Alko, Dexter, Quality, or other popular trailer axle manufacturers. Contains 1 left and 1 right brake assembly. Stamped "Al-Ko"