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 Weaver style mounts; -STANAG compatible; Fits the Browning X-Bolt Long Action with 20 MOA rise