Keep your hands safe every prep time by working with sharp knives maintained by this 240/1000 Grit Edge Master Professional Combination Whetstone. With chopping tools in good condition, you can forget about a time-consuming prep or kitchen accidents. Work with your favourite blades for longer by keeping them sharp all the time using these coarse and medium whetstones. Include two kinds of whetstones to resharpen your damaged or extremely blunt knives (coarse 240 grit) and resharpen dull knives and remove burrs (medium 1000 grit) Needs to be submerged in water for about 5 minutes (or until bubbles are no longer present) before use Ideal 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