There was a rusty bolt in the frame of the lawnmower. It punctured and was ready to be repaired in 10 seconds. I used oil and tried to take care of the bits. I hope this set will last for many years. This rusty bolt has been a problem for a few days. Nothing could remove or break this bolt. I walked out with that beat and was done in no time. no bloody joints. Every mechanic knows the value of a tool that prevents injury. :)