The pilots are precision ground .005" smaller than bullet diameter. Designed for use with Forster case trimmers they will also work with Redding and Hornady case trimmers. These pilots are required to trim different caliber cases. Without the use of the correct pilot cases will not be trimmed square. To use, loosen the set screw in the cutter shaft, place the appropriate pilot in the shaft and tighten the set screw.
Fits: Forster "Original", "Power" Case Trimmer
Notes: The diameter listed in the item description is the bullet diameter not the diameter of the pilot