Features: 1. Excellent sharpening performance. 2. Double sided grindstone design as 400 grit for coarse sharpening and 1000 grit for fine sharpening. 3. Comes with a silica gel base, non-slip and safe to use. 4. Oval hole design to collect and hold metal chippings. 5. Super fine sharpening stone, perfect fit for knives fine-grinding and polishing. Specifications: Material: Diamond Base Material: Silica Gel Base Size: Approx. 175 x 88 x 30mm / 6.9 x 3.5 x 1.2in Diamond Size: Approx. 150 x 63 x 6mm / 5.9 x 2.5 x 0.2in(There is some error in manual measurement) Grit Type: 400 Grit + 1000 Grit Weight: Approx. 354g Color: As the picture shown Directions: 1. Soak the stone in water about 15 minutes before using, saltwater is better. 2. Sharpen the knife in the order of the first rough then precise. 3. When you sharpen the knife, hold the handle of the knife with the right hand, left hand fingers are lightly pressed to the edge of the knife, move in a clockwise direction. 4. The sharpening angle is best from 10 to 20 degrees. 5. Do not scrape the slurry off when grind, knife can be ground more of sharpness with the slurry. Package Include: 1 x Sharpening Stone 1 x Draining Base Note: 1. Only whetstone and draining base, no other stuff included. .