3 Antique Clock Keys Fits Schatz 400 Day Anniversary. This is a new set of 3 size 4 clock keys. All have 3.25 mm holes. You receive: 2 Nickel plated clock keys. One brass clock key. 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.