Brass Alarm Clock Bells Clockmakers Gong Repair Parts. This is a new set of 2 cast brass bells. These are replacement parts for grandfather clocks. Each measures approximately 4 11/16" (119.6 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.