I have been a diesel mechanic for 20 years now (over 15at a Caterpillar dealer and the last at a high end Yacht boat yard). I have never regretted making the investment in a quality tool or tool box. However on the tool box thing I will say of you shop around you will find a Snap-On, Matco, or Mac that is either a trade in, repo, or one that was ordered but never delivered at a very good discount. Buy larger then you currently need so it is a one time purchase, one of these brands top end boxes will last you a lifetime and be trouble free with a good warranty and parts system to support your investment. I do not see a Craftsman or lesser brand lasting anywhere near as long (if they are properly loaded with tools and used on a daily basis). Yes they will continue to hold tools but they will develop issues over time, I have seen it time and time again…