2 New Aluminum Oxide Sharpening Stones. This is a new set of 2 aluminum oxide sharpening stones. These can be used to sharpen knives, scissors, gravers, chisels, etc. One stone measures approximately 6" x 13/16" x 3/8" (152 x 21 x 9.5 mm). The other stone measures approximately 3 13/16" x 7/16" (97 x 11 mm). 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.