This kit has everything you need to change links on watch band, change batteries, or change your watch band altogether. So many different tools and parts but the included instruction pamphlet explains it all. Nice zippered pouch to keep everything organized and accounted for. I needed to change one of my spring bars because the watch repair guy who changed it the last time used one that was too small (and it kept popping out). Did not want to pay $20.00 again to change a $.75 part. Since I have a few watches, I knew this was a good investment. Comes with more extra spring bars than I will ever need. Tools feel quite sturdy and I am looking forward to using this kit for many years.