100 Pc Mounted Grinding Stones Lapidary Fits Dremel. This a new set of 100 assorted grinding stones. These are ideal for grinding, polishing, cleaning, etc. 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.