Lyman is one of the most recognized names in reloading, producing innovative tools for serious shooters and reloaders. Offering products that get the job done while still offering value and advancing technology. Lyman uses its years of experience and user feedback to offer the best performing reloading tools available. Metallic cases stretch as a result of both the firing process and the subsequent resizing process. When your cases reach a certain dimension, the original case length must be restored through trimming. These E-ZEE TRIM pilots are caliber specific case length guides for use with the Lyman E-ZEE TRIM Hand Case Trimmer. Each pilot is caliber specific so no measuring is required when setting up the E-ZEE TRIM. Just install the proper pilot and the case length is preset.