The Lansky 4-Stone Sharpening Kit is the best and easiest compact knife sharpening system you may ever use. Expertly-designed to give your blades a surgically-sharp edge, the Lansky 4-Stone features four different grades and variable angles to hone your blades: coarse (120 grit), medium (280 grit), and fine (600 grit), and ultra-fine (1000 grit). The Lansky is built to accommodate most types of blades with a extra-long clamp system and features a custom molded storage case for all its components. The 4-Stone also includes a medium triangle hone for serrated knife sharpening. A compact, professional system that will pay for itself after one use!