Lee Case Length Gage and Shell Holder .338 Federal. This set of tools is made from hardened steel to ensure a lifetime of durable performance and is precision-crafted to tight SAAMI specifications. The Lee Case Length Gauge gives you a fast and accurate way to trim your brass cases while also squaring the mouths. The shell holder is used to hold the case firmly in place during this operation and while using your Lee Case Trimmer Cutter. These tools help to ensure the maximum level of accuracy in trimming and squaring your brass cases. Specifications for Lee Case Length Gage and Shell Holder: Manufacturer: Lee Fabric/Material: Hardened Steel Package Contents: Lee Case Length Gage and Shell Holder Lee 90218: Case Length Gage and Shell Holder .338 Federal