Maintain your knives in the field to the exact angle you set with your Lansky Sharpening Kit! Featuring the same four angles as the legendary Lansky Controlled-Angle Sharpening 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. Four sharpening angles: 17, 20, 25, and 30 degrees.