This tool is flimsy, but it works if you are very careful. The watch case and tool must be held with a very firm grip when removing the case back, otherwise the tool can easily slip and scratch the watch. I highly suggest buying a watch case holder to hold the watch firmly. Unfortunately, you can't see the watch or what you're doing since the tool blocks the view. Even though you can get it to work, I think it'd be better to pass on this flimsy tool and buy better quality.