6 Studs on 5-1/2″ Bolt Circle Trailer Brake Drum designed for 5.2K axles. Includes wheel bearings 1-1/4″ (LM67048) x 1-3/4″ (25580), grease seal (I.D. = 2.25″), 1/2″-20 lug nuts / studs and 2.45″ outside diameter dust cap. Can be used with electric or hydraulic brakes.INSIDE DIAMETER: 12″ x 2″# OF STUDS: 6 @ 1/2″-20CAPACITY: 3,000 lbs. per drumBEARING SIZE: 1-3/4″ (25580) x 1-1/4″ (LM67048)BOLT CIRCLE: 5-1/2″