Harbor freight drill bits are not the best spend a little more for a better bit. Just my 2 mags. There are deals to be had there but bits aren't one of them. From my experience with them.
How far we have come. https://theaviationgeekclub.com/the-b-36-peacemaker-was-so-huge-that-catwalks-were-placed-inside-its-wings-so-that-mechanics-could-maintain-the-engines-in-flight/
Hiya doin brother Mike I'm a retired Sheet metal worker I've had the pleasure of working with a lot of pipe fighters. I hope you are enjoying your time. I was an outside dog.