10" x 2-1/4" Trailer Electric Brake Assembly (1 right + 1 left) Pair of 10" x 2.25" electric trailer brake assemblies with parts. Works with Al-Ko, Dexter, Lippert and Quality Trailer Axles Comes with mounting bolts, nuts, and lock washers 4 Hole Mounting Contains 1 left and 1 right brake assembly. Tagged C9-1 10R or C9-1 10L