The EGW .357 Magnum 7-Hole Cartridge Checker is a precision reloading tool designed for efficient quality control of .357 Magnum ammunition.EGW Model 70122 Cartridge CheckerSpecifically designed for .357 Magnum cartridges7-hole design for checking multiple rounds efficientlyChamber checker for verifying proper cartridge dimensionsEssential tool for reloaders and ammunition quality controlPerfect for reloaders who need to verify their .357 Magnum cartridges will chamber properly ensuring safe and reliable ammunition performance.