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on Orders Over $99Crucible Industries CPM REX 121 is a high-vanadium, cobalt-bearing tool steel engineered to provide exceptional wear resistance, attainable hardness, and red hardness in high-speed steel. Bridging the performance gap between high-alloy tool steels and carbide materials for demanding industrial applications, it delivers extreme hardness and unmatched edge retention when used in knife blades. This unique version of the popular Sage 5 highlights REX 121s remarkable properties with its full-flat-ground, satin-finished blade. To emphasize its elite status, it also features distinctive burnt-orange-colored peel-ply-textured G-10 scales. All other features of this knife remain true to the proven Sage 5 platform, including nested skeletonized stainless steel liners, a robust Compression Lock mechanism, and a reversible wire clip for ambidextrous tip-up carry.