HORL®2 Premium Sharpness SetThe Finest Accessories For The Finest Kitchen Knives. The corundum whetstones with #3000 and #6000 grit designed to further refine the result of the sharpening process after using the diamond grinding disc of the HORL sharpeners. When simply screwed onto the sharpener, you can refine the edge of the sharpened blade of your high quality kitchen knives by using the #3000 and then the #6000 to achieve maximum sharpness. You can use the stones without