Designed to be the fastest sharpener to re-bevel serrations. Millions of monocrystalline diamonds resharpen serrations faster and more precisely than any other sharpener. The Diamond TRI-SEPS® 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-your-selfers, mechanics and sportsmen.