Weaver Grand Slam Rings have been engineered and manufactured to instill confidence, confidence that your ring will not fail when you are making the shot of a lifetime. Each Grand Slam Ring starts as a piece of solid steel bar stock and is slowly and meticulously machined into a finished ring. Each ring features an integrated square recoil lug for superior ring-to-base contact offering maximum recoil resistance for the ultimate hold on your scope. Proudly made in the U.S.A. Features and Specifications: Maximum Strength Solid Steel Construction No-Slip/No-Strip Torx Head Screws Integrated Square Recoil Lug Fits Weaver Style Bases