My wife cleans used watches and replaces batteries to sell in her organization's thrift store. I take the backs off so she can replace the batteries. For most watches it's not difficult, but for some it's next to impossible. I use several tools to pop or pry open the back. This is the latest one I've purchased to pry open the backs, and it works very well for some of the watches that are very stubborn. The tip of this tool must be hardened steel because if something gives it isn't this tool. In the past we've had to throw away watches I simply couldn't open, but this tool will make a dent in the number I can't open. This tool won't open all watch backs, but it will help a lot.