The Hornady Lock-N-Load 9mm Luger Cartridge Gauge is an essential precision tool that allows reloaders and shooters to verify their cases and ammunition for proper fit in SAAMI standard chambers.Hornady Lock-N-Load 9mm Luger Cartridge GaugeChecks cartridge and case dimensions for SAAMI chamber compatibilityEnsures proper ammunition fit and functionEssential quality control tool for reloadersPrecision-manufactured for accurate measurementsPerfect for reloaders who demand precision and reliability this gauge helps ensure your 9mm Luger ammunition meets proper specifications for safe and accurate shooting.