2 Watchmakers Riveting Hammers Jewelers Hobby Tools. Swiss Design Hammer. This is a new Swiss design hammer. This hammer is great for metal working. Has a face that measures approximately 3/8" (10 mm) in diameter. The length of the head measures approximately 2 1/2" (62 mm). The hammer measures approximately 8 7/8" (225 mm). Metal Riveting Hammer. This is a new metal riveting hammer. Great for watchmakers or other light work. One end is flat and the other is chisel shaped for spreading rivets. Has a face that measures approximately 3/8" (10 mm) in diameter. The length of the head measures approximately 2 1/2" (62 mm). The hammer measures approximately 9 3/8" (238 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.