Lee Rifle caliber Trim Dies are designed to be used with the Lee  Deluxe Quick Trim and Value Quick Trim Case Trimmers. Each die is made  to hold the brass cases securely while the cutter is turned to ensure  that case mouths are cut square and the case is to the exact desired  length. Each die is threaded 7/8"-14 to work in all reloader presses  that accept standard reloading dies.