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The Norton mechanical knife and scissors sharpener is a set of durable carbide rods encased in plastic, with a molded grip that protects the hand during sharpening; a v-shaped groove at the top of the tool sets the correct angle for pull-through sharpening of knife blades, and correctly-angled scissors slots in the center of the tool simplify sharpening of left- or right-hand scissors. This sharpener is portable and readily stored. The carbide rods create a smoother, sharper edge on dull or damaged straight-edge knife and scissor blades. Carbide is hard enough to sharpen metal tools, and as a sharpening abrasive, it is more durable than silicon carbide or aluminum oxide, although it creates an edge that is less sharp. The 6 x 2 x 5/8 inch (H x W x D) dimensions of this tool make it suitable for hand sharpening use. (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.) Sharpening stones, or whetstones, are abrasive surfaces used to sharpen and hone the edges of steel cutting implements, such as chisels, knives, scissors, hand scrapers, and plane blades. Sharpening is the process of creating or re-establishing a cutting edge by grinding away portions of the metal to adjust the angle of the edge and reform the shape. Honing removes small imperfections. Stones can be flat, for working flat edges, or shaped, for edges that are more complex. Sharpening stones are made of natural or synthetic materials that range from softer to harder, and are categorized by the size of their abrasive particles, known as grit. A stone with a coarser grit is used when more metal needs to be removed (e.g., when sharpening a nicked or very dull blade); the stone with the finest grit produces the sharpest edge. Where numbers are assigned to specify grit, they range from coarser grit (low) to finer grit (high). Some sharpening stones