These bushings are created specifically for Lyman's Case Trim Xpress. By using bushings that contact on the shoulder of the bottle neck type cases, the Case Trim Xpress will quickly and cleanly trim your brass by simply pushing the case against the long lasting carbide cutter. The bushings support and center the case with the cutter. No pilots are needed! The bushings are spring loaded to provide a smooth, effortless cut; and allow the user to trim approximately 15 cases per minute.