Monkeybrother Watch Press Set / Watch Case Closer with 12 Dies Watch Repair Tool Kit, Perfect Kit Watchmaker Cast iron press and ABS dies ABS Dies will not Scratch or Mark. And there is metal screw-socket in the middle of dies. So it is very easy to install them Take the watches to a jeweler to change the batteries. This set makes it so much easier and much more frugal. Comes with 12 assorted dies to allow for 50/48 46/44 42/40 38/36 34/33 32/31 30/28 26/24 23/21 20/18. Great for snap on watch - dies snap on and off quickly and easily.