This Whetstone Sharp System features a unique combination 400/1000 Grit dual whetstone that makes sharpening safe and easy. With a large and small guide rail for precision sharpening and flattening stone to level the stone before use, you can get a top-notch sharpening experience each and every time. Non-slip base and storage provide stability and convenience, while clear instructions give you the confidence to sharpen your knife with care.