Steel is heavy duty, and that comes at the price of weight. In an effort to combat weight while retaining the rock solid performance Warne is known for, Warne created the Warne Mountain Tech ring and base line. CNC machined from 7075 T6 aluminum & 60 percent lighter than steel Mil-Spec hard coat anodized finish Black oxide coated stainless steel hardware for the ultimate in corrosion resistance Mil-Spec 65 in/lb., 1/2" tactical nut attachments for securely clamping to the rail Fits Picatinny & Weaver style mounts and are NATO-STANAG compatible Available for 1", 30 and 34mm tube sizes; in Low, Medium, High and MSR ideal height; For maximum compatibility with most scope/firearm combinations