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 & we'ver style mounts and are NATO-STANAG compatible. Available for 1", 30mm , 34mm, 35mm and 40mm tube sizes; in Low, Medium, High and MSR ideal height; For maximum compatibility with most scope/firearm combinations.