I purchased this kit as a cheap alternative to get a lot of tools inexpensively, and to see if I like the hobby before spending a boat load of cash on tools.  The case opening tool broke the first time I used it.  I then tried to use one of the jewelers screw drivers and the bit was loose and just spun around freely.  I tried to use another screw driver to tighten it, same thing.  Overall this is a very cheap kit, that is basically worthless.  On the plus side, the seller refunded my money quickly and was very supportive and understanding.  If you need tools for watch repair, look elsewhere.