The Lyman Pro maximum cartridge gauges offer more features than any other cartridge gauge available. Drawing inspiration from the Lyman Pro die sets, these gauges are precision-machined from corrosion-resistant stainless steel, ensuring a long, rust-free lifespan. The flat surfaces on the exterior prevent rolling, while the integrated O-rings offer a non-slip grip. The Pro maximum cartridge gauges are designed to inspect pistol ammunition for case length, diameter and overall cartridge length. This inspection is deemed essential by leading competitive shooters who require complete reliability from their competition ammunition. The pro maximum cartridge gauges precisely assess pistol ammunition by verifying case length, diameter and overall cartridge length to ensure compliance with stringent dimensional specifications This inspection is deemed essential by elite competitive marksmen who require absolute reliability for their competition-grade ammunition