The EGW .223 Remington 7-Hole Cartridge Chamber Checker is a precision tool designed for accurate cartridge and chamber measurement for .223 Remington ammunition.EGW Model 70150 Chamber Checker7-hole design for comprehensive cartridge fittingChambered for .223 Remington caliberPrecision machined for accurate measurementsEssential tool for reloading and gunsmithingPerfect for reloaders gunsmiths and shooting enthusiasts who need to verify proper cartridge dimensions and ensure safe accurate ammunition performance.