Upgrade Your Brake System: Designed for trailers and RVs with tapered axles up to 7000 lbs/8000lbs/10000lbs/6000lbs/3500lbs, this electric brake drum has a 12-inch(for 7000lbs option)/12.25 x 3.375 inch(for 8000lbs and 10000lbs option)/12 x 2 inch(for…