4pc Electric Trailer Brake 12" x 2" Assembly Right & Left SIde 6000 7000 Axle 4 Electric Trailer Brake Assemblies 12" x 2 1/4" Bolt Circle diameter: 4" | Center Hole diameter: 3" Rated up to 3,500 lbs to 4,000 lbs **Will Replace most Dexter & Lippert Brake Assemblies**