Cobalt
not "Kobalt"
I've found that cobalt bits are way less likely to over heat and blue the end.
My local Lowes lists an index set for $32
The singles I've been buying nearly all have a pilot point.
That's cool, too.
They are 35-40% more than the "titanium" bits but are well worth it as one cobalt bit used correctly will last longer then 5 or more lesser bits.
Slow, and big chip.
You can tell it's working.
