My brother bought the larger set posted in the first comment. He asked me to use it to replace the battery in his watch and shorten the strap on his sons new watch. I'm usually good with intricate jobs (like soldering phone and laptop motherboards). I too found the screwdriver failed and began to spin in the handle, I proceeded to use the long-nose pliers to help pinch the shaft and rotate only to find not only did the screwdriver head deform but the end of the pliers also deformed so much so the jaws no longer mated.

These are really tiny tools and need to be accurately crafted from strong materials to take apart well crafted timepieces unfortunately they are rubbish made from the poorest quality plastics and cheese grade metal. I threw the lot in the bin and advised him if he had any love for his watch he would never allow such crap tools or parts anywhere near it.

Its cheap enough to have a pop if you like screwing around with £$%^ tools but I would seriously think first before you use one of those el-cheapo pins to keep your watch attached