Four Sharpening Angles: 17, 20, 25, and 30Carbide slots sharpen in 3-4 strokesCeramic benchstone for fine polishingRugged metal construction Maintain your knives in the field to the exact angle you set with your Lansky Kit! Featuring the same four angles as the legendary Lansky Controlled-Angle System, for the perfect portable Sharpening accessory. 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!