Replacement Case Trimmer Cutter The case trimmer cutter trims .17 to .45 caliber cases. The Trimmer Cutter is designed to trim cases to length and has been perfected over the last 70+ years to give you a flat square cut with little effort. Hardened to 60 Rockwell. Trimmer Cutter = Cases up to .490 (.17 - .45) Note: May be used with the Stainless Steel Case Trimmer and Stainless Micrometer Case Trimmer Power Adapter compatible