From the Lansky website: 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!
Lansky Knife Sharpener: Lansky QuadSharp Knife Sharpener, LK-QSHARP