Zero MOA; Tapered 6-48 screws; Mountain Tech brand; Precision CNC machined from 7075/T6 aluminum for a high strength and 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 and we'ver style mounts and are NATO-Stanag compatible