The Battle Steel MRO mounts are precision machined from a single piece of 7075-T6 high strength aluminum. Available in both Co-Witness and Lower Third Co-Witness options. Lifetime Warranty / 100% Satisfaction Guaranteed Specifications: Body: 7075-T6 Aerospace Grade Extruded Aluminum, Type III, Class II Hard Anodized Screw, Nut & Clamp: 12L14 Steel, Black Oxide Light Weight: Only 2.3oz Return to Zero 100% Made In USA Lifetime Warranty