Thick, Solid and Whetstone: Made of professional grade white corundum, perfect for the larger chef's knives, gives a working area for any size of knife, corrosion-resistant, heat-resistant, edges and corners are clearly demarcated 2 Grit Sides Best Sharpening: 400 grit side has good metal removal rate, light scratches edge. Intermediate stage before finer grits. 1000 grit side leaves metal edge with frosted appearance. Edge sharpness equivalent to majority of factory edges on knives, . Suitable for Grinding Operations: Kitchen knives, hunting knives, kitchen shears, pocket knife, chef knife, porting knives, straight , cutting class knife grinding, tool, garden , art appliance and ceramic knife, but serrated blades and ceramic knife etc Safety with Silicone Mat: The non-slip silicone keeps the stone firmly in place, amazing experience without moving at all 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. 400 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, 7.09 inch(L) x 2.36 inch(W)x 1.18 inch(T) Weight: 19.75oz. Package Contents: 1 x Sharpening stone 1000/400 Grit 1 x holder Only the above package content, other products are not included. 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.