HIGH-QUALITY DOUBLE-SIDED KNIFE SHARPENING STONE: Coarse side 1000 grit leaves metal edge with frosted appearance. Edge equivalent to majority of factory edges on knives, tools; Fine side 4000 grit is Perfect for finishing and polishing the edge, make edge sharp, and edge reflects light well. 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 MOST GRINDING OPERATIONS, such as kitchen knives, kitchen shears, pocket knife, chef knife, porting knives, straight , cutting class knife grinding, precision tool, garden tools and art appliance, EXCEPT serrated blades and ceramic knife etc. THE SAFETY SHARPENING WITH NON- SILLICONE BASE: The non- 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 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 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 common for the final stage for many kitchen knives. 4000 Grit Side: This fine grit is to put an edge on a tool or knife that exceeds any commercial edge you'll find. This grit is fine and sharpen slowly. This is to be used after you've created an edge with more coarse grits. Instructions to use: 1. 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 out with a little force, and then gently retracted. This process takes about 15 minutes. Then use the #4000 grit side for fine grinding. This process takes about 10 minutes. 4. After sharpening , clean with wet cloth or water, then dry it. 5. Use 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 base holder Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.