Brake Drum Hub 5 on 4 3/4 Bolt Circle Drum Size 2 1/4 inch x 10 inch Fits 3,500 lb Axles for many types of trailers Includes hub, bearings, dust cap, lug nuts, and seal Outer Bearing Number 44649 1 1/16 inch inner diameter Inner Bearing Number 68149 1 3/8 inch inner diameter Rated to 1750 lbs per hub Works for electric or hydraulic brakes