8 New Diamond Coated Cutting Wheels & 2 Mandrels. This is a new set of 8 diamond coated cutting wheels and 2 mandrels. Longevity is assured as the diamond particles are electroplated onto the surface of the metal. Each wheel has diamond electroplated onto both sides. These are used for cutting, grinding, etc. These wheels will fit perfectly onto a standard 3/32" (2.5 mm) mandrel They can be used with a Dremel tool Each wheel measures approximately 3/4" (19 mm) in diameter. 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.