Athlon Precision Rings are made in the USA from High Strength Aluminum Alloy. Designed for precision rifles including magnum calibers.A four screw ring cap design paired with a single nut base and recoil lug cross-bolt. A scalloped profile increases surface area in the rings flex points while reducing mass, ensuring these rings will hold your scope tight! Ring Screw Torque spec, 18-20 in/lbs, Nut Torque Spec 65 in/lbs.