Designed to be used by the armed forces, this triangular shaped, portable ceramic sharpener has a built-in angle guide to quickly restore a razor sharp edge to serrations, plain edges, entrenching tools, scissors, darts, fish hooks, ice picks and other instruments. The unique triangular design features two radius sizes and provides sharpening for both large and small serrations. Includes military-spec bead chain and clasp. A must-have sharpener for all military personnel, backpackers, do-it-yourselfers, mechanics and sportsmen. Made from premium grade 96% alumina ceramic. Overall length 4.5".