The Combination Starter Sharpening Stone is just the thing to keep knives extremely sharp and like new. With two different grit levels, the stone is able to produce excellent results every time. The Stone has a silicone base guaranteeing it stays in place while in use. The Stone is able to easily repair damaged edges or blunt knives. The Stone is great for restaurants, cafes and catered events. - 400/1000 grit - Sold per each