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 sharp, and edge reflects light well. Perfect for light touch-ups to an already sharp. HIGH-GRADE WHETSTONE ENSURE EFFECTIVE SHARPENING RESULTS: sharpening stone is made from professional grade white corundum, corrosion-resistant, heat-resistant, edges and corners are clearly demarcated. 1000/4000 GRINDSTONE IS SUITABLE FOR MOST GRINDING OPERATIONS, such as kitchen knives, kitchen shears, pocket knife, chef knife, porting knives, straight razor, cutting class knife grinding, precision tool, garden tools and art appliance, but EXCEPT serrated blades and ceramic knife etc. GUARANTEE 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. 1000 Grit Side: This grit is a very good overall grit. It is fine enough for many jobs and still have enough abrasive properties to do sharpen knives and tools that are not very dull. If you keep your knives and tools in good shape, you'll find yourself reaching for this grit level often. This grit is also very common for the final stage for many kitchen knives. 4000 Grit Side: This fine grit is able to put an edge on a tool or knife that exceeds just about any commercial edge you'll find. This grit is very fine and sharpen very slowly. This is to be used after you've created an edge with more coarse grits. Instructions to use: 1. Soak the sharpening stone with water for 5 minutes, then put it on a steady surface such as a table or a desk. 2. First use the #1000 grit side for coarse grinding in 10~30 degree angle, push the knife out with a little force, and then gently retra