Athlon Optics PRECISION RINGS are high-quality, precision-machined rings made from aircraft-grade aluminum. They are designed to hold your scope securely in place, even under the recoil of magnum calibers. The rings have a four-screw ring cap design paired with a single nut base and recoil lug cross-bolt, which provides superior strength and durability. The scalloped profile increases surface area in the rings flex points while reducing mass, ensuring these rings will hold your scope tight!Athlon Optics PRECISION RINGS are a great choice for shooters who demand the best in performance and durability. They are available in a variety of sizes to fit most scopes, and they come with a lifetime warranty.Overall, Athlon Optics PRECISION RINGS are a great choice for shooters who demand the best in performance and durability. They are made from high-quality materials and are precision-machined to ensure a perfect fit. They are also backed by a lifetime warranty.