Starting in aviation as a basic mechanic was made so much easier with this toolbox, it has 95 percent of what you need day in and day out. The remaining 5 percent is very inexpensive, high quality materials you can purchase separately. Ive bought a few other items here and there and not a single tool has broken on me. And I use them day in and day out for almost two years now. Im gonna be a returning customer for a long time.