I got this opener to use with my Invicta watches and it did the job, but users should pay extra attention and caution when using. The opener is not the best-made out there. It isn't very precise and honestly speaking, it feels kind of cheap. The entire unit is made of metal, can't say what kind, but it is metal. The tabs used to grap the watch have some wiggle on their sides, which I think contribute to the problems I had.

But, at this price, I wasn't expecting any more. The opener did the job, but be extra careful when using it, because this tool is not well made; it will give in when you think you have a good grip on the watch's back plate. So, to avoid more damage or any damage, make sure the tool is in all the way, and "very tight", or it will come lose as you start to turn it. Adjusting the tool to the watche's size, is easy, simply turn the knob you see in the middle.

After using it, even though it isn't the best, I don't see it breaking any time soon. I would, however, try to keep it lubricated. A couple of drops of W40 or hair clipper oil will do the trick.

If you are picky about the way your watch looks in the back, I would definitely NOT recommend this opener. Using it requires not just pratice, but patience and being aware that it might possibly come off as you turn it and most likely leave marks on your watch. So think about it before you buy. Hope this helps.