The case holder holds the case for trimming, primer pocket reaming, neck reaming and de-burring with our Uniform De-burring Tool. The L.E. Wilson Trimmer Case Holder provides the ultimate accuracy and uniformity for trimming your cases. The unique design of the case holder supports the case body, much like a chamber of a firearm. The Case Holders are precisely manufactured for consistent results and repeatability. 243/308 Win/358 Win/338 Fed/7mm-08/260 Rem/9.3x628.5x63