All Brenton USA magazines are made to the highest level of quality for the most demanding level of hunters. Manufactured 100% in the USA, using .025” thick wall, 410 stainless steel, and heat treated for superior strength and durability. Brenton magazines are also chemically treated against corrosion (QQ-P-35). Interior dimensions measure a generous 2.315 +/- .002 for long loads. These magazines will last you a lifetime.