all the work that has gone into sizing watch bands...if you have this tool, you can do the task in seconds... the guy at the mall charges over $5 to change the band and it takes him a half hour... or for $5 you can do it at home, and then fix it if you need to make additional changes.  Great product, but be carefull as the tips can break if you do not apply them correctly.  Easy to use, super quick.