SPECIFICATIONS - General duty 10" x 2-1/4" Trailer Electric Brake Assembly that works with 3,500 lbs. Al-Ko, Dexter(K23-026-00&K23-027-00), Lippert, Rockwell and Quality Trailer Axles DIMENSIONS - 10” diameter x 2-1/4” wide, 4” bolt circle, 3” center hole diameter HARDWARE - 4 Hole Mounting. Comes with mounting nuts and lock washers INCLUDED - 2 left hand side and 2 right hand side M-PARTS AUTO- M-Parts Auto specializes in trailer parts & accessories using the highest quality materials General duty 10" x 2-1/4" Trailer Electric Brake Assembly that works with 3,500 lbs. Al-Ko, Dexter, Lippert, Rockwell and Quality Trailer Axles. These brakes are rated for 3,500 lbs and have a 4-bolt mounting flange bolt pattern. Manual adjustment is required and adjuster plugs are included. This product is compatible with most manufacturers and comes with a limited 1-year warranty. One left brake. (2 left and 2 right)