This L&G Watch Case Opener is specifically designed to open and close Rolex watch cases quickly and easily. Six individually sized dies, with "serrated teeth", match perfectly to the backs of most sizes of Rolex watches, making it easy to open the watch case without scratching or marring the watch. It also works great for opening any other screw back style watch case, when combined with our Case Opener WA628. Can be mounted to a bench for added stability. Includes instructions and 6 rings.