Soledi Knife Sharpener Diamond Knife Sharpener 3 Stage Diamond Coated Sharpening Wheel System Black The Soledi Professional Knife Sharpener with revolutionary 3-stage sharpening system will keep your ceramic and steel knifes constantly sharp. No more guesswork on how to sharpen your knives. Easy operation: Simply run your dull steel knife about 3 or 4 times through the "coarse" slot by pulling the knife towards you, and twice through the "fine" slot to remove burrs, and enjoy a perfectly sharpened knife in seconds!!! The ceramic slot can be used to hone a ceramic knife to hairsplitting sharpness. Keep it next to your cutting board and enjoy sharp knives for slicing your favorite meats, vegetables, fruits, etc. NOTE: * This product was designed for straight-edged knives only. Do not use on scissors or serrated knives. Do not pull knife back and forth. Knife should only be sharpened by running it through the slot from heel to its point. Size: about 20.5 * 7.5 * 4.8cm=8*2.9*1.8inches