2 New Spiral Drills. This is a new set of 2 spiral drills. These hold twist drill sizes: 1 to 2 mm. To use just move the center piece up and down. Each measures approximately 7" (177 mm) long. 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.