CPM REX 121, from Crucible Industries, stands out as a high-vanadium, cobalt-bearing tool steel, meticulously engineered to deliver unparalleled wear resistance, maximum attainable hardness, and exceptional red hardness, filling the performance void between high-alloy tool steels and carbide materials in rigorous industrial settings. Translated into the realm of knife blades, it offers exceptional hardness and unmatched edge retention, as showcased in this distinct iteration of the Sage 5, featuring a full-flat-ground, satin-finished blade to highlight the remarkable properties of REX 121. Elevating its elite status, the knife also sports burnt-orange-colored peel-ply-textured G-10 scales, while retaining the proven Sage 5 platform's features, including nested, skeletonized stainless steel liners, a robust Compression Lock mechanism, and a reversible wire clip for seamless ambidextrous tip-up carry.