I got this tool for my large watches (I should have read the reviews) and I'll probably be able to use it on women's watches.  I tried it on a 43 mm Planetimer (Thats one of my smaller watches) and it wasn't coming close. I just ordered a Paylak TSJX1327 Watch Case Opener Extra Large Watch Repair Kit from Amazon.  I'll let you know how it works.  There is zilch documentation on this tool (Professional Jaxa Type Watch Case Back Opener) so I don't know how big a watch it can handle.  It might be great on small watches but I don't know because I haven't tried it.