First, there are no instructions on how to use this.  I searched the web for instructions on Paylak tools and found nothing.

The second thing about it and the main reason I'm returning it is that it contains no bits for waterproof watches.  All of the bits were way too big to fit under the cover groove.  The groove of course has to be small so that no water can get in.

Grooves big enough for these drill bits would easily let water in.  Therefore this is clearly not for waterproof watches.

I'm guessing that the people who used this successfully did not use them on waterproof watches.

I believe this is for a screw on case back, not a snap on.  For people with snap on back, this will not work. Paylak needs to put this in the item description.

I was really wanting this to work because now I am going to have to send my Timex watch to Timex and pay them 10 dollars to change the battery.

If anyone reading this review can recommend a good watch changing kit for Timex indiglo waterproof watch, please let me know.