Lansky QuadSharp 4-In-1 Combo Knife Sharpener -The built-in ceramic polishing benchstone also allows the QuadSharp to be used as a fully functional, stand alone sharpening solution. The smallest, most versatile multi-angle sharpener available! Four Sharpening Angles: 17, 20, 25, and 30Carbide slots sharpen in 3-4 strokesCeramic benchstone for fine polishingRugged metal construction100% compatible with all Lansky Kits and accessories