Diamond Mini-Sharp Sharpener easily travels with you. Folding handle protects the stone when not in use. Lightweight and ultra portable, handy key chain swivel ring for your keys or attach to zipper pulls. Sharpening with diamonds is fast and easy. No messy oils needed sharpen dry or with water. Offered in extra-coarse, coarse, fine and extra-fine diamond grits. Ultra portable, key chain sharpenerSharpens knives faster than conventional stones with DMT's monocrystalline diamond surfaceNo oil is needed, sharpen dry or with waterDurable construction will provide years of consistent performance and reliable serviceFine diamond for a razor sharp edgeCarded