12 New Mandrels. This is a new set of 12 mandrels. Can be used with flex shafts, Dremel tools and drill presses. Felt cylinders, rubberized abrasives and grinding wheels can all be used with these mandrels. Each measures approximately 1 3/4" (44.5 mm) long with 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.