Pilot tip... I think B&D called theirs Bullet drills. Have an old set somewhere. I liked the way the spot cutters worked on mine. Doesn't go too deep in the center metal. But yes, the tradeoff is you have to grind some away.
I sold Blair, Rotabroach and a couple others on the truck. There was one bit that was molybdenum boron or something like that. Good stuff but spendy. Spot welds are so hard.