The Wusthof Tri-Stone Sharpener is ideal for sharpening blunt knives and maintaining them regularly. It contains three stones with different grit sides in one convenient tool. Use the coarse 240 grit side to remove nicks in your blade and create a sharp new edge. Use the medium 1000 grit side to restore a previously-sharpened edge. Then use the fine 3000 grit side to hone and maintain that edge. This sharpener comes with a convenient wood storage case and water bottle.