Sharpener with special fishhook groove, easy to maintain hooks and fillet knives! Folding handle protects the stone. Lightweight and ultra portable, handy key chain swivel ring. Coarse diamond (45 micron/ 325 mesh) to quickly restore a neglected edge. Fine diamond (25 micron / 600 mesh) for a razor sharp edge. Handy Size: 5 1/2" opened. Size: 2 11/16" x 15/16" x 3/16". No messy oils needed—sharpen dry or with water. Durable construction. Made in USA.