This hub & drum assembly is an aftermarket part made by AxleTek and fits on Dexter 9-10K General Duty axles manufactured after July 2009. 12-1/4" x 3-3/8" drum size and 865 bolt circle with 5/8" studs. Races and studs are pre-installed. Replaces Dexter 008-430-05 hub & drum or Dexter 009-123-01 drum only. Uses 387A inner & 25580 outer bearings (Not included).