Features 1.The sharpening speed of the diamond is faster than the traditional sharpening stone, durable structure can provide long‑term stable performance. 2.Combine rough grinding and fine grinding, first rough grinding and then fine grinding and polishing. 3.Suitable for polishing of outdoor knives, home kitchen knives and garden tools, wide compatibility, fodable, easy to carry. 4.400 grit is used to sharpen the blade, or to sharpen the thickness of the blunt blade quickly. 5.The 600 grit is fine grinding, 98% of the sharpening work can be done with 600 grit grindstone. Specification Item Type: Folding Whetstone Material: ABS + Diamond Color: Black Fold Size: Approx. 12.5x3x2.5cm/4.9x1.2x1.0in Unfold Length: Approx. 22.6cm/8.9in Weight: Approx. 62.0g/2.2oz Quantity: 1Pcs Thickness: 600 Grit/400 Grit (double side) Package List 1 x Folding Whetstone