I made this thread awhile back. You get what you pay for, and quality hex wrenches will save you a lot of headaches in this hobby.
Thread 'Tips and Tools for Removing Stubborn Fasteners' https://www.rctalk.com/forum/threads/tips-and-tools-for-removing-stubborn-fasteners.131281/
I have had Dynamite tools and used the hell out of them for years on my 3d printers and RC's. They still look like new.
Not very good pics, but these are what I have
MIP brand is highly recommended also.