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. These rings are proudly made in the U.S. for maximum strength with solid steel construction. The no-slip/no-strip torx head screws with integrated square recoil lug fits Weaver style bases.