2 Oil Cups For Clock & Watch Repair. This is a new set of 2 single hole oil cups. The difference between a watch that works or not may just be some oil. Both cups are made of plastic. The hole in each one measures approximately 3/8" (10 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.