The Forster Collet #4 is specifically designed for use with Original and Power Case Trimmers providing precise cartridge case trimming capabilities for reloading applications.Forster Collet #4 for Original & Power Case TrimmerModel CT2004 (UPC: 757253003905)Compatible with Original and Power Case Trimmer modelsDurable construction built to lastEssential component for accurate case trimmingThis collet is an affordable and reliable replacement or spare part for reloaders who need precise case trimming with their Forster Original or Power Case Trimmer systems.