The 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 water. When the sharpening process is done, the knife is wiped over the HORL® leather to free the blade from all grinding residue and provide the final sharpness. Important Notes: Compatible with HORL® Sharpener 1. Gen, HORL® 2 and HORL® 2 PRO. This item is not compatible with the HORL® 2 CRUISE. HORL Premium Sharpness Set Includes: HORL® Leather HORL® Whetstone - #6000 fine HORL® Whetstone - #3000 fine