Road Choice® Brake Drums are manufactured to meet the toughest requirements of the heavy-duty North American aftermarket based on recommended SAE practices and are covered by a one year warranty. Every Road Choice full-cast Brake Drum is machine-balanced to 20 in-oz. specifications, per industry standards. This helps reduce vibrations and improves roll characteristics for a better ride. Bolt holes are drilled to provide tighter mounting tolerances. Machine-balanced eccentrically over 180°. No weld weights or CNC drilled material. Machine-drilled bolt holes. Not cast. Brake Drum are manufactured in an ISO 9001-2000, ISO TS16949 and EN ISO14001 certified factory, ensuring superior quality products.