I could be wrong ,but I think this is only thin and is not designed to fit over the base of the crystal to create a edge , its only a holder.
If you have a deep edge/ recess this would mean you have to remove the bezel on the watch ,which will fit back over the top. As I say I could be wrong but from the ones I have seen and as I have understood it ,it just makes it easier to pick the glass up as you will need both hands to twist/ hold the tool.
Hopefully someone can correct me if Im wrong !