Warne Mount Base X-Bolt Short Action - The Warner Mount Base X-Bolt SA is the ultimate lightweight precision scope mounting system. When every ounce matters, and every shot counts, these are the scope mounts you can depend on. 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 and are Nato-Stanag compatible