Precision CNC machined from 7075/T6 aluminum for a high strength & lightweight platform – Mil-Spec hardcoat anodized finish for abrasion and corrosion resistance. – Bases feature black zinc coated hardware for “Element Proof” protection. – Self centering tapered T-15 Torx screws. – Fits Picatinny & Weaver style mounts and are NATO-STANAG compatible.