deal for sharpening straight-edge knives at a 15 to 30-degree angle through a constant back-and-forth motion. Comes with a non-slip base to keep the whetstone in place while sharpening. Choose one of the available grits, depending on the condition of your knife: Medium 1000 Grit: This is the main sharpening grit and used for re-sharpen and remove burrs. Fine 3000 Grit: Use to bring up the sharpest of edges, great with custom made and Damascus style knives. Needs to be submerged in water for about 5 minutes (or until bubbles are no longer present) before use. Construction: Ceramic and plastic Dimensions: 18.5cm x 6cm x 3.25cm