36 New Grinding Stones. This is a new set of 36 assorted grinding stones. Great for accurate grinding of materials such as steel, porcelain and glass, as well as for soft and precious metals. They can be used with a Dremel tool. Each has a 3/32" (2.5 mm) shank. 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.