HIGH-QUALITY DOUBLE-SIDED KNIFE SHARPENING STONE: Coarse side 1000 grit leaves metal edge with frosted appearance. Edge sharpness equivalent to majority of factory edges on knives, tools; Fine side 4000 grit is Perfect for finishing and polishing the edge, make edge very , and edge reflects light well. Perfect for light touch-ups to an already . 1000/4000 GRINDSTONE IS SUITABLE FOR MOST GRINDING OPERATIONS, such as kitchen knives, kitchen shears, pocket knife, chef knife, porting knives, straight , cutting class knife grinding, tool, garden tools and art appliance, but EXCEPT serrated blades and ceramic knife etc. HIGH-GRADE WHETSTONE EFFECTIVE SHARPENING RESULTS: sharpening stone is made from professional grade white corundum, -, heat-, edges and corners are clearly demarcated. THE SAFETY SHARPENING WITH NON-SLIP SILLICONE BASE: The non-slip silicone base holds the sharpening stone securely in place, so you never have to worry about the whetstone slipping off the counter.