This Lee Precision Case Length Gauge is the easiest way to trim 7x57 Mauser cases to the proper length while squaring case mouths at the same time. The hardened steel Case Length Gauge is precisely sized to produce cases perfectly trimmed to the SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) standard length. The specially designed shell holder helps keep everything square.Specifications and Features:Cartridge: 7x57mm Mauser (7mm Mauser)Country of Origin: United States of AmericaMaterial: Steel