Kit Includes: 387A inner bearing- (2-1/4" inside dimension), 25580 outer bearing- (1-3/4" inside dimension), 382A inner race- (3.8125" outside dimension), 25520 outer race- (3.265" outside dimension), P10488 oil seal - (3.875" O.D ? 2.875" I.D). This Trailer Bearing Repair Kit includes everything you need to replace the wheel bearings on one trailer brake drum. This kit is for axles with 10k brake drums.