Southwest Wheel 6-hole, 5.5" Bolt Circle Brake Drum for 5,200 lb Axle 6 studs 5.5" bolt circle using 25580 inner and 15123 outer bearing. Contains inner bearing, outer bearing, 2 1/8" id and 2 1/4" seals, solid grease cap and lug nuts. Fits a #42 Spindle Drums are pre-raced & pre-studded. For use with 12" drum brakes