Precision CNC machined from 7075/T6 aluminum for a high strength & lightweight platform - Mil-Spec hardcoat anodized finish for abrasion and corrosion resistance. - Rings feature stainless steel hardware for �Element Proof� protection. - 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.