This conversion kit upgrades the Trim Pro trimmer to eliminate the need to purchase additional Trim Pro Shell Holders. This conversion features spring-loaded jaws that accommodate cases from .250-inch to .625-inch. Note: Not for use with Rotary Case Trimmer or Rotary Case Trimmer—2. Note: Cases with rim diameters larger than .625-inch must be trimmed on the 90352 High Capacity Trimmer.