At Qichang, we offer brake drum and brake assembly for you. The brake assembly comes complete with a backing plate with 5-6 holes for mounting, brake shoes, upper double retracting springs, lower under-mount adjustment spring, magnet and wiring. The design of this right hand break assembly is superior and the uniquely designed magnet generates a substantially higher pulling power than other electric brakes at the same amperage. Due to the electrical wiring, this brake assembly should not be used with watercraft trailers. Our brake assembly work on trailers with axles rated up to 7000 pounds.