Precision CNC machined from 7075/T6 aluminum for a high strength and lightweight platform; Mil-spec hard coat 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 and Weaver style mounts; NATO-STANAG compatible; Zero MOA; Designed and made in USA