Silicon Carbide Sharpening Stone Whetstone Tool New. This is a new silicon carbide sharpening stone. One side is coarse and one side is fine. It is hard, sharp and tough. Long recognized for the clean, sharp surfaces it produces on tools, dies, blades, molds and almost any other metal piece requiring sharpening or smoothing. It measures approximately 5" (127 mm) long. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.