Perfect for any toolkit whether you're a professional watchmaker or a hobbyist.
This tool does not like other metal opener tools, it will never scratch or damage your watch.
It's smart design allows it to fit and evenly grip the surface, giving it more strength yet never scratching your watch.
Inovative tool, makes you open the watch in an easy, precise, and safe way for any but the most difficult waterproof case backs.
This is a watch repair tool, not a toy ball, only use to open the screw thread back watchcase Squeeze the ball, make friction between the ball and the back case, and then rotate the ball to the case "open" direction.