Lyman 20mm Vulcan Case Prep Tool & Novelty Round (7777820)Lyman has machined the most unusual case prep tool available! Cut to the same dimensions as the 20mm round used in the famous Vulcan Rotary Cannon, the cartridge has a 8 32 thread in the base to accept case prep tools. It comes packed with large and small primer pocket reamers and cleaners. In addition, the tools can be stored inside by unthreading the bullet from the case. When not in use, the round makes a great display piece and conversation