Thick, Solid and Large Whetstone: Made of professional grade white corundum, perfect for the larger chef's knives, gives a nice 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, tools. Suitable for Most Grinding Operations: Kitchen knives, hunting knives, kitchen shears, pocket knife, chef knife, porting knives, straight , cutting class knife grinding, precision tool, garden tools, art appliance and ceramic knife, but serrated blades and ceramic knife etc Safety with Silicone Mat: The non-slip silicone base 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