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, ; Fine side 4000 grit is Perfect for finishing and polishing the edge, make edge very sharp, and edge reflects light . Perfect for light touch-ups to an already sharp. HIGH-GRADE WHETSTONE 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 GRINDING OPERATIONS, such as kitchen knives, kitchen shears, pocket knife, chef knife, porting knives, straight , cutting class knife grinding, tool, garden and art appliance, but EXCEPT serrated blades and ceramic knife etc. THE SAFETY SHARPENING WITH NON-SLIP SILLICONE : The non-slip silicone 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 are not very dull. If you keep your knives and 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 exceeds 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 : 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 the #1000 grit side for coarse grinding in 10~30 degree angle, push the knife out with a little force, and then gently retracted. This process takes about 15 minutes. Then the #4000 grit side for fine grinding. This process takes about 10 minutes. 4. After sharpening the knife, clean the knife with wet cloth or water, then dry it. 5. a soft brush to clean the sharpening stone, then placed in a ventilated place out to dry. Material: White Corundum Color: Light Green+White Dimension: 18*6*3cm Weight: 19.75oz. Packing List: 1 x Sharpening stone 1000/4000 Grit 1 x holder Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.