Maintain your knives in the field to the exact angle you set with your Lansky Sharpening Kit! Featuring the four angles 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. Four sharpening angles: 17 (fillet & fine slicing), 20 (skinning & kitchen cutlery), 25 (hunting & outdoor knives), and 30 (heavy duty cutting & chopping) degrees.