Sometimes a saddle might seem to be well tightened but you hit a bad bump or pothole and it moves a bit. That's when it's really nice to have the proper tool to tighten it with.

One of the most satisfying repairs I ever did was on a rail-trail about 2 kilometers from the trail head. A family were out for a nice Sunday ride and had gone that far when the chain on their Tagalong trailer/bike came off and wedged between the frame and freewheel so tightly that the wheel wouldn't turn. I was able to loosen the wheel nuts with my 6" adjustable wrench and then put the chain back on the freewheel. That family was so grateful and I was very happy that they were able to continue their outing. That's the biggest reason I carry such a comprehensive repair kit. I also refuse any monetary payment for doing any of those repairs.

Cheers